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That's just one of the reasons why I completely killed my Amazon subscription, same with Disney and Netflix. Fuck that DRM BS.
Just get your stuff on the high seas and enjoy. I do subscribe to Max, and can play it all at 4K HDR in all my devices. I'll pay for services as long as they're worth it.
I think they're using Widevine DRM. And with DRM they can enforce whatever arbitrary policies they like. They set special restrictions for Linux. I think Amazon set 480p as max, Netflix 720p and YouTube 4k or sth like that. AFAIK it has little to do with technology. It's just a number that the specific company sets in their configuration.
But... Why? Why would they get different restrictions on the basis of operating system?
Because you could use the Linux one to save the file unencrypted because it's not locked down.
I could do that on Windows, too. Piracy os equally possible on both
It's whether the OS has hardware to make the platform "trusted." Android does by default with Widevine, Windows does by default with TPM and Widevine, Linux does not by default.
"Trusted" here of course means, trusted by the company, not by the user. If it's a trusted platform, it has a cryptographic key exchange space that the user does not have access to. This prevents a spoofed DRM certificate or other interception of the HD stream, which in theory prevents a stream from leaking.
"In theory" of course, because every piece of content is ripped and available DRM-free as soon as it's released.
Companies put weird restrictions on quality to encourage pirating... company logic in nutshell....