There’s supposedly a LOT of that going on - see some of Nerdrotic’s videos where he discusses how he’s suddenly lost thousands of subscribers a day.
On weekday mornings I listen to Mark Simone on WOR in NYC. He’s really great. He speaks occasionally of how his number of twitter subscribers hasn’t gone up a bit in recent months and that recently nobody seems to be retweeting his comments. He just laughs and makes some comment about twitter censorship.