I have a Sony x90ch, it has no ads, just a thin panel with some content suggestions which we ignore. It may be because I run it through pi-hole but I don't think Sony tvs do ads in general. I had to make to not accept a particular option for a service, don't remember the name, which does tracking. Pretty stock Android from what I can tell.

Compared to what I've been hearing about Samsung and LG it's been rather nice in this respect.