I find it quite odd that more mixers aren't jumping in to fill the void left by their predecessors, though.
Maybe they are released but we didn't hear about them yet, and it takes time to built something that actually works for mixing and privacy.
They must be much better protected now if they want to survive attacks and seizure from regulators, and this is going to be even more intense in future.
I figure that the only way you are going to get something in this space through is by developing it under a pseudonym, like how Satoshi did with Bitcoin.
It sure is getting very risky developing anything related with privacy these days, if your identity is known to public than you can expect someone knocking on your door soon.
Sooner or later though these new mixers will need some form of promotion. And there could be signature campaigns here. But yeah, the risk involved, and it's going to be like a cat and mouse game moving forward. New mixers created new algo to be anonymous as they can be and then government trying to break that and stop them before they become so huge and being "used" by criminals to hide everything.
And it echoes to me what
Bitmixer.io says when they closed like 6 years ago. And they might be right after all.