You can also set your DNS in settings to an adblocking DNS such as Mullvad, that works really well for me. Rethink is also for for more precise control.
Mullvad link to their dns servers: https://mullvad.net/en/help/dns-over-https-and-dns-over-tls
Not sure why Netflix wouldn’t be on the Aurora store. Anyway, I did use android TV on an OdroidXU4 for a few months. It worked well with an air mouse and made it work like a regular android TV. Only issue I had with it sometimes was getting it to wake up after being asleep for some time, but that issue could have been ROM+odroid (or air mouse) specific.
Yes you should, but you have take your data safety into your own hands. You cannot trust Google, Apple, and other big tech companies. That is not to say that these companies should get away with the things they do, there should be punishment… but that is the reality.