it uses x11; wouldn’t that make it less secure?

I bet using an adblock would make it much more difficult for your phone to call home. Try adaway

https://lemmy.dbzer0.com/post/8546229

Nophonespam, old, ugly, but does the job

System76 and other linux hardware manufactures make coreboot computers, it might get a bit expensive than buy some old thinkpad but I suppose if you’re searching for this you have the budget