They could have probably made a 100k by disclosing this to Twitter. The reward/risk graph seems concave down and not convex up.
$7k vs $100k, you choose.
Sure, you could short stocks and then make "Aaah, Tesla is going bankrupt!" tweets... But without an army of lawyers and accountants and money to pay them, it's hard to anonymously short stocks.
You could bribe people with publishing DM's - but again that's pretty high risk. And how do we know that hasn't already happened?
What else is there?