How to Turn Off Smart TV Snooping Features

Step 0: never connect a smart tv to the internet in the first place. Their software is inferior to dedicated media devices like Apple TV anyway.

How about using Pi-hole? Most of the blocked requests come from my Samsung TV but not sure it is sufficient.

Don't buy one? Seriously just get a good projector and hook it up to a pc. Lots of good extra content too if you know where to look...