Wait, they're not letting you stream because of your OS? That's bullshit, I'd pirate it on principal at that point. No sense in waisting time trying to get your browser to report a different OS to work around it.
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Using Linux means DRM protected content either plays in terrible quality or in RakutenTV's case not at all. Netflix is limited to 720p with low bitrate and Amazon limits to ~540p.
Changing user agent doesn't work because it's the DRM who decides whether the OS is supported.
Linux users have to decide between low quality legal streaming services, or piracy with high quality. It's not a difficult decision for me and my giant HDD.
Edit: I forgot the third option: streaming sticks (Roku, FireTV).
I'd honestly prefer this than to what Netflix does: Don't warn you at all but then limit you to 480p or whatever. Now THAT is some bullshit. But hey, at least this way no one will ever be able to pirate 4k shows off Netflix, right? RIGHT?