Quick Answer
Every keyword can be exact match. You can still lose half the budget to Other search terms Google hides. Fence the leak with Keyword Planner, visible terms, and Search Term Insights themes as broad match negatives.
You paid for clicks you cannot name
You run a niche account with high CPCs, so every keyword is exact match on purpose. Tight keyword targeting is how the account survives.
Then you open the Search Terms report. Match Type Integrity looks broken. More than half the spend sits in Other search terms. Google cites privacy. You still get billed the full CPC. Those unnamed clicks do not turn into customers when the niche is this specific.
This shows up a lot. Search term data gets hidden in a lot of accounts, anywhere from 20% to 80%. A campaign that is 100% exact match can still put 50% plus of spend in that bucket. One high CPC niche account put 53% there. The people who already know have stopped being surprised. If you just found it, that quiet is part of the sting.
You will not get a full receipt. Google has no reason to hand you every query. Exact match still fires on a close variant. The report then parks a pile of that traffic where you cannot negative the actual string.
Keep exact match. Fence the leak.
AI Max will try to talk you into broader matching. Skip that pitch if you already chose exact because your CPCs cannot absorb junk. A few voices will tell you to go broad and let the algorithm sort it. In this niche, that usually spends more on queries you cannot see.
Some people write a script that negatives every query that is not the exact keyword. That can swallow part of the hidden bucket. It usually does not swallow all of it, and traffic often falls. Treat that as a side option.
The useful work is a fence you build before the next spend cycle. Broad match negatives knock out whole junk categories. That beats mining the Search Terms report one string at a time. Search Term Insights then names the part of the bucket you still cannot see.
Exact match will keep leaking close variants. Shrink what that leak can spend. I would not switch match types hoping that stops it. The leak is already in exact.
Watch the spend split. Other search terms as a share of spend should drop after the first cycle. If it stays near 53%, the themes were too narrow, or you added them as exact negatives and they did nothing. Broad match negatives on a theme are the point. Watch a few conversions too, so you do not learn the wrong lesson from a quiet week.
How to fence Other search terms before the next cycle
Step 1. Pull Keyword Planner for junk you can predict
Open Keyword Planner. Look at the ideas around your exact keywords. Take the irrelevant keywords, plus the single words that never belong in your niche. Add those as negative keywords now. You are building the fence from public query data. Waiting another week of CPC to teach you the same lesson is a waste.
Step 2. Negative every off intent term the report already shows
Export the Search Terms report. Anything visible that is off intent goes on the list. Do this once, thoroughly. Those visible queries are also clues. They often name the categories leaking into Other search terms. File a support complaint if you want. It will not unhide the bucket. The negatives will.
Step 3. Open Search Term Insights and name the hidden themes
Go to the Insights page. Search Term Insights will not print the hidden queries. It groups them into themes. That is the only grouped view you get of the hidden spend. Write down every theme that is not your buyer. Those names are what you fence next.
Step 4. Negative those themes as broad match, then watch the bucket
Add the junk themes as broad match negatives. Check that you are not blocking a good query in the same pass. That ends Search Terms whack-a-mole. Give it a few weeks. The bucket will not hit zero. A smaller share of spend in that bucket is the win. The exact match spend that remains should look like the terms you picked.
If this is the hole in your Search Terms report, Stop Flying Blind is my free resource on keyword targeting precision. Use it before the next spend cycle starts.
FAQ
Does this still happen if every keyword is exact match?
Yes. Close variants still trigger. A high CPC niche account on 100% exact match can still put 53% of spend in Other search terms. Match Type Integrity fails in that bucket even when you set the match type correctly.
Will Search Term Insights show me the hidden queries?
No. It names themes. You still do not get the individual search terms. Use the theme names as broad match negatives. That is the visibility you get.
Should I switch to broad match and let the algorithm sort it?
Some people say that, especially with AI Max in the mix. In a high CPC niche, broad just fills Other search terms faster. Keep exact match. Fence the leak with negatives.
Can I just keep adding negatives from the Search Terms report?
Add the ones you can see. That only trims the part Google already showed you. If 53% of spend is in Other search terms, the visible list is a small slice. Do the Planner work and the Insights themes or the bucket barely moves.