A group that's policing who can use their services based on political disagreements is definitely not a group that it's safe to do business with. Who knows what they'll take offense at next?
(And just for the record, I disagree with the utility of Yarvin's technical architecture for the same philosophical reasons I disagree with Moldbug's political prescriptions. But I find his perspective refreshing and analysis spot-on. And I find social ostracization based on traditionally-unassociated context extremely repugnant)
"Vocal advocate of white supremacy and racial slavery" seems like a bit of a slander, but maybe I'm missing part of the equation.
You're not. The main issue is that Moldbug writes in depth about controversial things, without including enough Leftist bromides like "Hitler was the worst" or "slavery is evil". This is very triggering to Leftists in the tech industry and so they want him removed from any conference where he happens to be presenting a talk.