It is not a matter of thinking or belief, there is documented Evidence of this political bias from many sources and from many Tech companies.
The debate comes into place because the Tech companies will still ban people for clear rules violations even though they are on the "correct" side, direct calls for violence as an example
But the even the rules themselves on most of these platforms show a political worldview toward one side.
This is also influenced by the massive shift in the overton window over the last 4 years, so much so that many people on one political side seem to have whiplash.
So I do not doubt you will find people that will disagree with what way the bias leans, however when you have documented and video evidence of the bias in one direction then the debate is much less valid