I was to surprised today, to see that Proton VPN is available on Apple Vision Pro, but there still is no version for Apple TV which has to have a much bigger install base.
and meanwhile it does already work with 3rd party clients:
https://www.reddit.com/r/ProtonVPN/comments/1b9qjjx/guide_proton_vpn_apple_tv_with_passepartout/
To use with all kinds of streaming services?
ah to bypass region lockouts and the like?