The main reason in my view is to prevent them from knowing what’s really going on and what will happen.
The people in power always want to know what’s going to happen ahead of time (not bringing a piece of legislation to the floor until they know they have the votes to pass it, for example). Because they want to affect what’s going to happen or mitigate what was going to happen.
All the pollster had eggs on their faces in 2016. Because the electorate was so fluid and the pollsters were so biased that they were shocked on election day.
I like the ruling oligarchy and also pollsters being shocked on election day. We’ve already seen it in several races in the primaries this year.
2016 isn’t the norm though. Both sides know this midterm will be close. Fake polls only help the Dems and allow cover for the cheating. The polls were “correct” in 2020 were they not??? Ponder that.