I'm the one who also experienced those kind of fake news since last 4 years. Fortunately so many time i safe myself to be victim of those scammer. Nowadays those are become so common issue, known to everyone but i'm just wonder seeing some people who still believe those kind of fake and face big damage from scammers.
Instagram and Twitter should block the fake rich guys who made millions with day trading, newbies simply fall to their traps. The first question should be when the person checks these ads: Will I sell the trading system to other people if I am able to make a $5000 a month with it? If the answer is no, you can ignore this advertisement and report such posts to save the time of other potential victims.
Blocking all those accounts isn't as easy as we say. It can solve the problem but it is very easy for those people to remake an account and start the process all over again. All I can say is people should be more educated about cryptocurrency or other aspects that are connected to it for you to be protected, Typical scammers/pretenders tell their victims too good to be true ways of earning money. The methods of scammers are being created every day that why a good education can prevent these things to happen.
AFAIK, Social media platforms, and Google started to not accepting malicious advertisements that can harm their users.