I have the 65" version of the same set, but I have not yet been subjected to any ads on the LG app screens. I did notice last month that ads will pop up (and interrupt in-progress programs) if you switch to the LG provided channels (starting at 200 I think). I rarely look at those (or any broadcast content for that matter) anyway. Mostly the set is used for Netflix/Amazon Prime/Apple TV.

This location has a pi-hole DNS for everything, so I may not bet getting all the ads they are trying to serve to me.