OP, that shit goes on everywhere scams are found--and yes, bitcointalk isn't immune from it although I haven't seen many blatant examples of scam-busters going rogue in a while (unless I've missed something very obvious).  I remember a few years back there were a few members who seemed to appear suddenly and make a fast reputation for themselves by sniffing out scammers, only to pull shenanigans of varying degrees of seriousness.

If you asked me to provide names, I wouldn't be able but I'm sure members with better memories would if they've been here since at least 2016 or so.

And Jesus, it seems like Youtube has turned into nothing but a drama TV service with 20-somethings slamming everything, including each other.  And yep, they're usually shilling questionable crap from their sponsors like Established Titles and whatever else.  It's maddening, because no matter how many times I clear my browser cache, I always wind up with the same suggestions within minutes and it's all the same style of content as OP described.