This happened to me a few times for my reviews in Germany. My 1-star reviews were flagged by the business as "defamation" although it contained only facts and personal opinions. I provided additional proof like screenshot of their documents (one of them was a language school), but they deleted my review at the end. I was so frustrated, I even considered deleting all of my two hundred something reviews from Google Maps.

You just made me check a business where I left a negative review and was threatened with a lawsuit. I didn't remove it, but Google did automatically. Looks like I'm still algo-banned from leaving a review there (I even tried a 5-star review with no text, and was told their AI found it a violation of content policy, lol) but now above most of the obviously bought 5-star reviews with generic test is a 6-month-old negative review with a lot of "likes", stating the owner files criminal complaints against negative reviewers, they appealed to Google twice, they defended themselves in court, and they saw other negative reviews had been reviewed. (possibly mine)

Of course, it also has a reply from the owner, stating this review that says he files criminal complaints against reviewers is a complete lie, and therefore, he's filing a criminal complaint against this reviewer.

I already deleted all my reviews from Google Maps. Spent all that money and effort installing a wheelchair elevator in a listed building, then when updating the info to say basically, "it's still not exactly wheelchair-friendly as a 120 year old building, but there is a wheelchair elevator and a HC toilet now", Google algorithmically accused me of lying.