BmB: Mixes like "Games that treat GOG users as second class citizens" were really good for detecting anti-consumer practices from a glance at the store page. I have to wonder if this isn't part of why they have been removed, years of work maintaining those lists flatly deleted. Simply to please publishers and keep buyers confused and buying multiple copies.
I started and maintained that mix for roughly 4 years, so thank you for the kind words! And yes, that would be the most likely explanation, especially considering how the official explanation ("It was an outdated feature, lol!") was a bunch of baloney. As I never tire of pointing out, you could edit and adjust gogmixes on the fly, or even outright delete the whole thing. All of those features still haven't been implemented in the review section, so even the ancient gogmixes were miles ahead in terms of functionality.