It's probably a parody by idk who. Serious or not, it's definite reaction to lgbdropthet. I remember stumbling on the lgdroptheb sub on Reddit in the summer. It had pretty low activity then. It has since been privated. The lgtdroptheb sub open now looks like what the other sub looked like with the same level of activity.

Because of the internet, the communities can possibly exist and thrive on their own now, at least in the more developed parts of the world. It was the advantage of strength in numbers that incentivized the formation of the LGB(and later T). And that advantage still applies wherever it's needed.

As of now it's needed in the West because of TQ+++ overreach and the total pushback against their behavior is not currently substantial enough for the L, G, and B as separate groups to be addressing effectively. It needs to be a unified front for this reason until the situation improves.

And a unified front for those who are same-sex attracted will definitely be needed for a while in the areas of the world with more traditional homophobia.

Beyond that though, I'm not sure what future I want for the B right now. Don't have strong opinions on that yet.