https://en.m.wikipedia.org/wiki/Master_Quality_Authenticated

Basically trickery with alleged lossless, but it is not even close to lossless and you need very special players that can unfold MQA. Tidal got a lot of criticism for it and eventually switched away to FLAC…but the way they handled it was pretty bad and it still brushes me the wrong way.

I rather pay for the enshitification of Qobuz, than pay those crooks at Tidal any money. That MQA shit is still very deep and practically enshrined in my soul…