One option is to use a older version of TrueNAS until some alternatives start to show up.

I would probably keep my NAS offline so it does not phone home.

That can be installed on any hardware, as opposed to just a TV directly. That I could get behind.

Gemini is a hot pile of garbage.

When I ask Gemini for directions it starts to give me a definition, as opposed to opening maps and showing me the way. If I ask to turn off the lights I get a conversation and I end up walking to the light switch myself.