Flash a stripped down rom like LineageOS with minimal google services. De-crappify it. They are well supported and documented on XDA.

Ive never used a chromecast. Can they be flashed and de-googled?

I like Android overall, but I try and avoid as much google as I possibly can.

I made the mistake of using the LG smart tv features for like 2 years. I set up a pihole to block ads and eventually WebOS just quit working because ads and trackers did t work anymore. I factory reset the tv and switched over to a Roku stick. That worked well for nearly 4 years. Now I’m on a $19 ONN 4k streaming stick from Walmart. It’s actually kinda beef for what it is. Made by Asus and flashed LineageOS on it. Audio drops out and requires a reboot every few days. I want to move to a Nvidia shield but haven’t had the funds for it because I’m in a kitchen remodel.

Nice try totally not in the FBI Garry!!!