might be to strong as a word, but his thread has a clear message. I would have described this to advocate against crypto.

I don't really understand the 'advocacy against' part of that. Aside from the lexical contradiction, it seems there's no actionable purpose. What does he want people to do or not do? And what will be the result if they do?

To not get involved in crypto, because of the effects it has, who is pushing it and why.

It sounds like he's (successfully)advocating against participating in crypto to me.