This has something to do with public domain and that if these don't get released by the artist after 50 years or something, the recordings are available for anybody to release, no matter how bad the quality, so I supposed they figure better free bad quality from them than having to pay for bad quality from a pirate/bootlegger. Apparently other artists are doing similar things....
Yes, copyright it and release it before it becomes public domain. I see a lot of public domain classical on Qobuz.
This Pink Floyd stuff is terrible quality, very disappointing from a band with such high standards. I'm sure they could have found better bootlegs.