I actually do think professionals are using Twitter to make billion dollar calls, not because it's the smartest way to do business, but because its so hugely important for them to frontrun the normies. The whole buy the rumour sell the news thing. Same reason they're watching the news all the time too, even though they all know that the news is usually just there to explain the market movements that they've already profited from.
I'd argue that that these accounts are not usually brand new, but an account with an existing following that changes its name and details and then forks out the most market moving $8 ever.
Elon is one of the trolls... but he also might now be the most trolled person in all of history, it definitely feels like a whole lot of Twitter users are doing their best to break him.
This is what I mean about questioning reviewing the processes. If you know there is a riot at the local supermarket, you would likely go somewhere else to pick up milk.
I would argue it isn't the users as much as the media in general giving it all airtime. They thrive on and monetize drama, so will milk and create as much as possible.