Well, if they wanted to stick to the letter of the law, they'd immediately stop selling unregistered securities. It's not like it's difficult to register a security with the SEC.
Who gets to define them as unregistered securities? The SEC claimed BUSD is a security and shut it down. If stabelcoins pegged against the dollar with provable 1:1 reserves are a security then... SEC needs to be dismantled or reset.
BUSD are two different currencies operated by different entities, while pretending it was the same, or it was anyway. The one backed 1:1 was offered by Paxos in the US and the other printed by Binance as they saw fit, while pretending it was the same. That's why it was killed off.