Probably look into subscribers and most of the ratings of its content (likes/dislikes/comments), and you can see if that channel seems like a channel having plenty of sub bot fans. There are quite plenty of YT-ers there for crypto and I am pretty sure they already moved on from the purge that happened. Careful though as I've read a fake Binance channel having over 240k Subscribers.

Here's the thread for it: https://bitcointalk.org/index.php?topic=5214752.0