I have my suspicions about the genuineness of the Qubuz hi res tracks. I have bought quite a few and they do not sound right compared with those native tracks upsampled by my DCS Vivaldi upsampler/streamer. If all they are doing is selling "processed" upsampled versions (which I suspect they are) I prefer to do it with better equipment as they could do better!!
There's been a great deal of online chatter about this over the years and not just with Qobuz. (HDTracks was lambasted early on for selling upsampled Redbook as high-res.) Qobuz states they only stream (or sell) what the labels provide them and, if memory serves, they analyze what they're given to make sure high-res is indeed high-res. My streaming and purchasing experience with them has been stellar thus far, but then again, I don't play in the DCS levels of audio gear.