I watch a lot of financial videos on YT and noticed the sophistication of the spam has increased lately. Previously you'd have either:

- someone stealing the logo of the video owner responding to your comments with whatsapp links

- some MLM-esque praise for a particular person's crypto trading scheme.

for the second case, you now have spam bots replying to the top comment with a vaguely realistic sounding dialog with comments alternating between people asking for more information, similarly praising the crypto scheme, or giving contact information.

The comments section has basically become useless at this point due to the level of spam. You still have content creators encouraging you to comment to trick the YT algorithm though.