How to unhide my review that had been hidden by app developer? I noticed that one app that is licensed under GPLv3, while the app developer had not been publishing code updates on github for several years already. I decided to write a review on Google Play and stress this issue in it:



Since the review was added, many users upvoted it and app developer was quite angry at me. So he clicked some option, that my review was inappropriate/spam, after which it was hidden and became not seen to other users. Only I can see and edit it now, but visibility does not change.

How can I dispute this? Can I appeal to Google Play support team?
Normally, I would be right there with you about getting the code released and would go and fight with you, however they have made some changes, one of which being the licensing.
According to their website, they no longer use the GPL license, which started with version 2.7. They still have a commercial license available.

Sources
Until release 2.7, FBReader source code was dual licensed: GPL and commercial. Unfortunately, GPL violations were too regular. Since 2.7 the source code is only available for a fee. Please contact us for information about the commercial license.
The full sources of FBReader 2.6.15 for Android 2.x are available under the GPL from the git repository at GitHub.

If you were to look at the Wikipedia page, which uses a web archive page as the source, it will tell you that they use a GPL and commercial license. That need to be updated to reflect the new information.
Now, as to your review, what the app publishers are doing is correct. You are technically in the wrong. It is misinformation that you are posting and gives bad credit to the owners.