

Since you’re using Android TV already, I’d recommend configuring it to remove the ads via the use of a custom launcher, and install SmartTube Next for an ad-free, account-free YouTube.
In the case of the Hisense TV I picked for my grandparents, I found that Android TV kept wanting to revert to the default launcher, so used Launcher Manager to keep Projectivity Launcher as the default. While you can uninstall system apps via ADB, they tend to come back automatically, making the ‘hide app’ option of Projectivity Launcher useful to remove bloatware from the menu.
There’s also apps that can remap the remote buttons to open custom apps. Couldn’t get it to work on the Hisense TV due to there being a glitch with enabling accessibility options, but seemingly it works in most cases. Also note that unless you’re able to root the Android TV installation (also couldn’t do it for the Hisense TV) and install the SmartTube Bridge app, the Google Assistant button will still try to send all voice commands to the default YouTube app, so voice searches need to be done in the SmartTube app directly.
If you also want movies and TV shows, I’d also recommend installing Stremio with the Torrentio addon. While it needs a paid debrid account to be useful (about 3€ a month in the case of Real-Debrid), it’s a suitable catchall replacement for Netflix, Disney+, and other streaming services.
Definitely a good idea for mobile, though if on desktop, I’d suggest bypassing the website altogether and using a torrent aggregator such as Jackett, which can be integrated into qBittorrent via an extension.