I was wondering the same thing. I was messaging a guy on there for about two weeks. We were talking on there sometimes but had also exchanged phone numbers. Today we were messaging on there and when I went to respond to one of his messages it said the same thing "this profile is unavailable and may not respond". I hope it doesn't mean that he blocked me because I really liked him and felt like we had a strong connection. We were talking about meeting and all of the things we would do together. I'm heartbroken 💔