I will not detract from what you said because you have a valid point because internet and privacy do not mix well but now that (probably) the biggest mixer is out of business, it really does not look for the other mixers out there. I have no doubt soon they all will have to either shut down voluntarily in order to avoid having their domains seized or will suffer the same fate as Chipmixer.
It is impossible to be anonymous when you offer your services on a .com domain anyway. The US practically owns every .com domain out there. How on earth can they seize any .com domain they want? That's because they own the domain providers too. (hosting/domain providers pay taxes to the government which make them a government partner)
Privacy and Internet don't mix well.