Please, what is the different between MQA
Better question is what is the difference between MQA and true lossless hi-res content.
The nature of MQA was reverse engineered and explained. MQA si lossy compression and DRM mechanism, whose main goal is not to provide original lossless content to end customers. This main goal was not clearly and fairly explained to consumers and instead of that it was masked by propaganda "as artist intended", the nonsense things with blue or green light or dots, whose only goal is to take your attention and make an illusion of something perfect. The lossy encoding is not the only downside of MQA. The main downside is that without MQA decoder it is not possible to perform any usual DSP (even simple volume control, automated replay gain, balance control, simple equalization, room equalization, headphone crossfeed, 5.1 to stereo, ...) without loosing resolution. That's all going against the world of free or low cost software and hardware solutions and small companies. MQA decoder is not sold to individual end customers, it can be only licensed by companies producing DACs and software players. It is on decision of MQA Corp. who get the license and who not. The quality of MQA decoding may be very poor - look for example at computation capabilities used for MQA decoding on Audioquest Dragonfly.
On the other side, Qobuz, highresaudio.com, Deezer, Amazon and others are providing true lossless and hi-res content, where the discotheque or blue lights and dots is not needed to mask a reality which MQA Corp. (not artists) intended to hide. You can perform any DSP you wish with software or hardware solution of your choice without loosing resolution and without need to pay for licensed decoder.