This depends on the terms of the lease. That seems completely non-controversial to me. There's a bunch of stuff in my lease that I couldn't do, which are perfectly legal in many other contexts (smoke inside, have a dog, have big parties, etc...). Likewise, a KKK friendly lease would also be legal and honestly I don't think you'd have a hard time finding people who would be willing to have you.
And I've yet to find someone who has said they can't discuss their beliefs. They just don't get "our" support to do it.
As I noted, it depends on the terms of the lease. I was stating that if you violate the terms of the lease that eviction was non-controversial. That said, I'm not an expert in rental properties.
It wouldn't surprise me if all of these services have some verbiage in their TOS or contract that allows them the right to stop service if the content being served is deemed to be inappropriate by them.
And I've yet to find someone who has said they can't discuss their beliefs. They just don't get "our" support to do it.