The bias makes sense and I wouldn't call it a conspiracy theory. Where are the censors hired?

Californians have a different idea about hate speech than people from Alabama who have a different view of hate speech than someone from Bangalore.

So if you hire your censors from California you are going to see right wing rogue ideas considered hate speech.

I know tastes differ across space, but there must be some minimum standard that would satisfy almost everyone

Of course there is a minimum standard - but the problem is to have effective censors you need to give them a degree of leeway/self-judgement and in a politically charged environment this will lead to bias.