That's how this discussion started: The SEC blackmailed Musk into signing a settlement or otherwise the SEC would block Tesla's accounts. Well, it's either that or Musk, in fact, did lie about the funding to take Tesla private. reasonable people believe the latter, other prefer option one. And then people still wonder were Tesla's evaluation comes from.
It's about financing of Tesla's debt. That's something that banks do, and banks could deny funding (even of a bank overdraft) for almost any reason really, like an SEC lawsuit.
No-one ever talked about any bank account being blocked. But in a world of debt, where debt is provided by institutions, if you can control who gets loans, you can control a lot.
Citing from like three levels of comment up-stream.
Musk has also said he is going to launch legal action on this. Because that's almost exactly what happened, and it is unfair. So you are correct, and this saga probably still has more to go.
What's funny is almost anyone on the planet couldn't go up against someone like the SEC, which is why they can get away with this. Good on Musk for doing it.