Yeah, I use an old Dell optiplex micro running Zorin OS Lite, and watch all streaming services in my web browser.
This gives the bonus of blocking ads on sites like YouTube or Roku.
I use a Logitech wireless media keyboard with trackpad to control it. All hooked up to a dumb projector.
Fun fact, my parents have an Amazon Fire TV, and Amazon pushed an update 2 months ago that made it always turn on to an ad page, and slowed down all the interactions to the point of being almost unbearable.
Second fun fact: Vizio now makes more money selling access to advertisers than they make from selling tvs.