Pihole. There we go

And if they use dynamic, rotating IP addresses?

A better approach is scissors (cut the cord) or don't buy "smart" anything --- unless it actually costs *less* and can be easily used in a "dumb" mode (TV for example).

"Smart" means it intends to take advantage of "dumb" users. Any "smarts" will eventually be used against you by the manufacturer. They simply can't resist the extra $.

I have a 50 inch "smart" TV that serves as a dumb display and nothing more.