As of this morning my local gym had suddenly disappeared (yellow circle) and another gym had popped up with a different landmark at a different location. When I check the wayfare site it still says that the gym is there, but it certainly isn’t.
Niantic has been removing graffiti and individual disc golf holes simply for not meeting criteria. I asked about how to submit those and was told I could use any reason.
However, when I tried to submit in game reports for disc golf holes, they were rejected. When I use the form linked at the top here for “Reporting Abuse” there is an option there to choose " Fake Nominations or criteria issues", so I assume that is how this was reported for removal. Or, Niantic was just cleaning up the area and removed it.
I am going to start quoting instead of using the reply options so people know who I am replying to. I understand it is frustrating to lose a gym. I posted facts to answer questions, and hope nothing I said came off as derogatory towards you. I intentionally did not express any opinions one way or another on the removal. I hope the new one that popped up is accessible to you and you can have fun getting gold on a new gym.