“Some” would be OK, @RogerOhayashi, but the more you have, the more rigid the filter might become. It think, it was Morten who once wrote, if the number of hidden contributions stays below 10%, we are fine, but that was just common experience and no word from Google.
But all hidden contributions, although we do earn points, are simply useless and not helping the community of Maps users at all. Personally, I check after each upload, if all photos and reviews are public and if not, I try to fix it immediately.
I also keep track of total numbers of hidden photos daily. If an increase happens, I identify them and mark in my database, what became hidden some time after uploading, which can also be some years later and also try to fix the situation.
When I said “fix”, I distinguish these situations:
Long after posting a listing turns into an “Unknown Place”
This happens, if accidentally or purposely a place listing was deleted. In those cases, I never delete my photos. Some times, this happens to historical monuments and an appeal can be successful. If a business was closed, the listing should be marked as “Permanently closed”, but sometimes users delete the pins.
A review with media attached is hidden
Remove the attached photos or videos and see if text-only is accepted. Personally, Since two or three years, I never attach photos to reviews any more and rather post them directly to the place.
A text-only review is hidden
Depending on how important the review appears to me, I try to edit parts of it until i find the culprit and remove it. In one case, it was just a hyphen ( - ), in another case remove a misspelled word. But this is time consuming and I might decide just to delete it.
There is a special case in Germany and Thailand, where business owners can declare a review as “defamation”, but hopefully that never applies to you @pjr and @RogerOhayashi.
A photo (or video) is hidden
Unless linked to an “Unknown Place”, I just delete it and try a different one showing that place, if I still have more. In some cases a crop helps to remove a visible face or some text.
As I said above, recently we found out, photos made with a Galaxy S24 or S25 either need to be slightly cropped or handled as I described in Cannot upload images to reviews - #25 by WilfriedB
As a bottom line, to me it is important to be aware at any time, how many hidden contributions I have and which photos and reviews those exactly are. The latter is the toughest part and I still have four hidden reviews, I never identified.
Hope, this helps