I have a friend/acquaintance who had a similar experience on YouTube itself. He had created a large number of instructional videos on his YouTube channel, and from them he was deriving a significant passive income (admittedly from the overbearing amount of ads he enabled). One day he received a takedown notice suggesting that his videos were illicit copies. His investigations led him to believe that another YouTube u…
A month ago one of my videos about a reported and fixed XSS vulnerability was taken down for violating some rules (it didn't say what rules exactly). I submitted an appeal and it was reinstated a few days later.
Several years ago one of my videos that used some public domain footage was taken down for copyright infringement. I appealed it saying the footage was in the public domain and they reinstated my video several days later.