Plebstr was cool. Their dev team is amazing and wonderful people. I don't use OpenVibe because I have zero use for Bluesky and Mastodon. I'm #NostrOnly. 

 I don't have a use for it either. But it seems like a significant amount of people do and they seem to like it.  

 Could be also because Bluesky doesn't have a vibrant ecosystem of alternatives to choose from?  

 I actually have no idea what the bluesky options are 🤔 but it's possible