Wow. A lot of hyperbole and bluster here from somewhat miss informed people looking to make something out of nothing. Tidal wasn't charing extra for MQA files, only offering them as part of a paid plan. You had a choice to buy the plan - or not. You knew / or didn't what MQA was supposed to be about when you signed up and btw- MQA was never conclusively measured or otherwise shown to "sound" better than non MQA- which presumably may have led to some of its current status. There's no "class action" lawsuit filed or pending either.
Tidal class-action
MQA declared bankruptcy. I smell the fear of a class action lawsuit against Tidal. We could do that. Tidal has 8 million subscribers, we don't know how many or how long they all were paying double by subscribing to the 'nobody can prove Tidal has any tracks higher than 44.1khz' plan. They probably have lots of people on phones who haven't even heard of MQA who trust them and wanted the one that sounds better. They're right not to have to listen to any talk about MQA if they want the plan that sounds better.
MQA means you can't prove the file is an original copy or not. That Beethoven track you like it says is 192 could actually be Dua Lipa at 11khz.
The bankruptcy move was probably to protect themselves from Tidal, who is the receiver of people's funds.