This is a bad argument IMHO, and I don't see any damages for anyone in a lawsuit! People are completely free to quit Tidal at any time they want. Frankly I'm sick of the whole MQA argument and the constant bickering and hatred people have for them! I have a very resolving setup and tried both Tidal and Qobuz and decided to stay with Tidal and I'm very happy with them as are many other people. If you don't like Tidal then feel free to move on and stop bashing them and MQA.
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.