I see a lot of these too. They take over regular people's accounts, e.g. people from school I still follow, probably brute forcing passwords, then they post all this content how they are self made off crypto but the person in the videos doing the prostelyzation is in no way shape or form the same person who previously held the account.
Clearly they do this to get a decent follower count initially for their spam bots, but my word is anyone who follows John Doe actually going to believe a scam video that is clearly not John Doe coming from John Doe's account claiming to be him? There has to be more effective angles.