I got screwed by Sony for a smart TV that was abandoned within a year. Then none of the streaming sticks worked on it due to HDCP compability issues.
In the end I bought a broken Samsung 32" 1080p mostly dumb TV on ebay for £0.99, fixed it (power supply capacitor problem) and steal all my content and ship it on USB sticks to the TV which will quite happily play h264 / mp3 encoded stuff.
That doesn't surprise me at all. I just also know Roku has been around forever, so I trust that if a new service is added, it will be there. I don't know that I can say the same about other manufacturers (not that they _don't_, I just don't have the same level of trust there).
Eventually it should be there. For example, it took a long time for HBOMax to make it to Roku because they couldn't agree on how much of a cut of the subscription fees Roku should get.
AFAIK, the only mainstream streaming device that doesn't do this is Apple TV.