Send me some links. I want to see some of these games you think they turned on an engine in the middle of it because honestly I usually think OPs like this are whiny or sore losers... but you're right, I don't play 15 minutes, so maybe it's common here... so I'm willing to look.
But to answer your question, yeah, chess.com doesn't like bad publicity.
Also a lot of people don't know much about cheating, and topics like this can educate people on how to cheat and educate cheaters on how to cheat better.
Also people can get emotional and start attacking a player who is not cheating at all. The better way to deal with a person you think is cheating is to report them, and chess.com will look at some of their games and ban the player if they were cheating.
i played some games where I was amazed that, after I gained a mid game advantage, my opps kind of transformed into GM’s and crushed me. I’ve studied enough GM games to know when I’m just outclassed. 1700 players. It was weird. I searched for this topic and have found that these threads get locked up by the mods pretty quick. I think maybe this problem is much worse than most seem to give credit for. I’ve been shocked by the play of my opponents. 8 out of 10 are cheating, I believe, in post-analysis. Is the thread-blocking just chess.com protecting its money? Afraid we’ll all quit? Well, I’m close, so maybe. But still, That would be understandable. One thing I found noteworthy were all the players in comments sections who think it’s quite low...5-10% ...maybe if you’re playing blitz or bullet. At 15 minutes, which I play? It’s alarming. They cheat the whole time. They cheat when they’re starting to lose.