That is exactly how I mean "virtue signaling". If they had a few people looking to use their services, which they hold themselves out to the public to offer, and they didn't want to, then they could just say no. To post a public message about it is just a way to say "look at me world! I am a good person, doing the things that will make people like me". Some people wear burkas to show their allegiance to a way of thinking, some people post things like this. It is all a way to showing fealty.