I thought that developing this list was part of an effort to preserve privacy, especially after banning mixing services, but now mixers that have ref links appear first, and some ads appear at the top, so at least leave an option to click on referral links if they want to support the service.
You are right about this. But that's how it is in the affiliate business, those links that can bring profit to the blog owner are always highlighted first. It is logical to expect some kind of reward for the effort or at least possibly cover the costs.
Given that arriving directly or via a referral link does not change anything for the visitor, I do not see a particular problem with that.
For example, Bestchange is designed exclusively for this way of profit, and only services that have an affiliate/partner program can be included in their monitoring. It is their only source of income. (No sponsors, ads or anything similar)