Yeah… not much you can do beyond DNS-based blocking for most dumb SmartTV OSes and obviously sideloading iOS apps sucks if you’re not jailbroken. Cases like these are really where they get you!

Regarding Chromecasts, just in case anyone’s interested: they’re still Android under the hood, so you can simply send the Revanced Manager APK via Send files to TV and proceed as usual. FYI: you need to enable developer mode (see step 3, specfically) to install custom APKs – this won’t impact your warranty.