Find that 4k, streaming, and MQA all share a single purpose: copyright control.
I'm no fan of MQA, in that I cannot tell it does anything better, but copyright control (aka Digital Rights Management or DRM) is not one of the problems.
MQA recordings can be encoded to any common format like FLAC or ALAC, and copied like any other computer file. There is no DRM in MQA. None.
Best,
E