And why is that a bad thing ? That's the free market. The business owns the platform and you don't have an innate 'right' to be there.
Why is it a good thing? What's the motivation behind it? It just seems like a really unnecessary restriction to have when you're trying to launch a FOSS alternative existing software.
It’s a good thing because it gives companies autonomy to do what they want (within the law). It’s your responsabilità to take it or leave it.
The alternative is an oligarchy type model where you are bound to the whims of some external party.
Why are you opposed to running your servers the way you want? Why do you support people that don't run your servers controlling what you can and cannot say?