I won our smart TV at a conference I was at for my work a few years ago. I didn't have internet at the time because I live in a rural area so it didn't go by my house. I stuck the TV upstairs and this past summer, internet was installed on my road. So out came the Roku TV. We not only have Tubi, but Pluto is another free to use app that has just as many shows and movies as Tubi. Just search for Pluto and you'll be just as amazed.😎
Also, if you have an Amazon prime subscription for your free shipping, you also get access to tons of free movies and TV shows, just do a search for the "prime" app on your TV and add it to your line up.