AppleTV is the media box to use if you hate ads and value your privacy. Its Home Screen is just a grid of apps. No ads. None. It’s also way faster (CPU speed) compared to the competition.
Replacing a smart TV OS with a device made by Google or Amazon defeats the purpose. You’re still going to get ads plastered all over your Home Screen. And they still lag and stutter unless you pay a premium price for an 5 year old Nvidia shield. Either use an AppleTV or build your own HTPC.
My understanding is that Apple have implemented RCS, which funnily enough, does not even support encryption yet. Google had to roll their own proprietary add-on.
https://www.macrumors.com/2024/09/18/end-to-end-encryption-rcs-messages/