It’s a drop in the bucket, but I have a few invite codes to give out. If you are an academic and have a URM colleague who would like an invite, send me an email. Similarly if you have a PhD student or postdoc that you can vouch for who would like to come here, let me know.
When Bluesky was mostly for socializing and goofing around and blowing off steam and enjoying not being being on twitter, this wasn't such a concern. But as serious and meaningful scientific discussions among significant parts of the community start to take place here, we need to be thoughtful.