I think you could more or less instaban users who mention Telegram and nothing of value would be lost.
I see comment likes and replies from users called "Congratulations you've won…" or "Message me to win your prize" and if you report those, they are actually pretty much always removed (easy pattern I guess).
But nobody seems to have any luck with reporting fake celebrity scams, to the point that if you are a well-known user who has more comments than you can reply to, you more or less have to regularly post a video saying "I will never message you directly".
Oh for sure. But they'd just switch to saying "†e|_e gr@mm" or something. It does seem to me like the cheapest models today should be cheap and good enough to finally kill off this type of spam, though, if deployed correctly.
My preference would be that spam comments detected in this way get a bit set on them that causes them to be visible only to their posters, and posting more than one just causes all your future comments to also get that bit regardless of their content, but since it's a shadowban, it's harder for spammers to know that their account is burned.
Bot 1: “I have been using the services of Mr Bob John who is a financial advisor, he has made me $70,000 in the past six months. Very trustworthy”
Bot 2: “Oh wow! Will you please share how I can contact him?”
Bot 1: “sure, you can message him on Telegram. His username is BobJohn983739257”
Bot 3: “I have also used Mr Bob John services. He has been a reliable and faithful advisor.”