This has been an issue in quite a few online lefty spaces I've been in, and for the bigger picture I am in no way able to say why it happens because I myself am usually pretty far from the particular pulse of black culture, online or off. (Not really by choice as much as being too tolerant of being the only black voice in a group...)
There are certain approaches to how discourse often happens online especially due to being driven by white people with the mindset of being for white people (this isn't done consciously always either). I think especially examination of if things are being made to reestablish your own personal comfort over the necessary acceptance of differing view points is probably the biggest thing I'd recommend for white people trying to counteract that, at least to get started.
But I am less interested in making myself seem like some expert that if you listen to me black people will see you're one of the good ones. Because that's very much not a thing I or any other black person can do. First I don't even know fully what set of actions would work here, and second it's not like I have a bunch of black people waiting for me to give the thumbs up that these honkies are ok. It just doesn't work like that even if I did.
About the only thing I can say is that I think it's very well possible that the lack of a sorting algorithm is part of why. The very feature that defines this site, as desirable as it is, is a cause.
When you are running an algorithm to serve ads, the race of the person is one such thing that they want to match on. So if they can figure out you're black they can start targeting you and feeding you other black people.
Here, the real "algorithm" is the social interactions between people and their followers. So any black content rather than being picked up and funnelled to other black people, must instead cross the vast seas of white people to reach the islands of other black people.
If black people on here are even doing "black content", versus similar content to everyone else. Just for me personally, I'm so limited on what I post here because I don't really want this to be a second daily journal or just repeat of what I post on the fediverse. And while I'm writing explicitly about my blackness in my game, it doesn't really come up in my dev posts when my current focus is getting a taffy-based skunk cognitohazard working.
But that isn't to say that I don't want there to be "black content", because quite the opposite I'm starved for confirming and contrasting how other black people deal with being in this demon cracker world. I just don't have much I want to say myself.
Sorry, I'm rambling but mainly because yeah, I do agree it's a problem and I'm similarly desirous to find solutions to it, and like all things the best I can do is give my piece.
