I believe you could buy a random Android streaming box with an unlocked bootloader, and then install LineageOS on it. Not sure about the “streams from all the major services” part re: LineageOS, but last I heard it’s improving.

(There are also some boxes made specifically for this, usually sold as development platforms for STB products, marketed based on what SoC they contain. Though they’ll tend to be $200, while the random “finished product” streaming box will be more like $30. Both come with decent remotes.)