So far, mixers are legal, but no one knows what will happen in the future, but events such as the FTX have accelerated the issuance of many laws that restrict many exchanges, and the SEC may not have been as strict as it is currently, which means that more activities of darknet mixers will make it necessary to issue laws related to mixers.
We have bestmixer, chipmixer, blender.io etc that were promoted in this forum and has been seized, but until now there's no bold action. AFAIK only Sinbad that theymos decide to ban the account and move it to archival after the project is seized.
I do not think that the reason for their ban is that they are a mixer, but rather an attempt to continue advertising even after it has been seized, which means continuing to advertise something illegal, which is prohibited according to the rules.
11. No linking to illegal trading sites.