Mixers with their current business model cannot continue because they need to provide high liquidity with small profits that come from service fees. If we take ChipMixer it worked on donations. However, when the site was sized, they had a wealth of money, which is an amount that is impossible for one person to own. Or that you get it from the profits.

What I am trying to say is that the mixing services are a front for a business and it is not necessarily illegal, but it exploits the money of depositors in mixing the money they have, and therefore it is more difficult to track, but it is an activity that needs high liquidity, which means a party that has a lot of surplus money.

That party may extend from a government to an illegal activity that wants to launder money.