I am just guessing based on what people list in the twitter alts that it probably isn't that active. Think bluesky and activity pub are probably where it's at, with nostr as a bit of a curious outlier. But this is really not based on any stats just my suspicions. Think in my head gab, truth and Parler are kinda somewhat not in the race. Maybe that is my ignorance tho. And tbh all of this within the context of twitter/X *somewhat* being saved by Elon (yes yes I know the problems), I think the platform /protocol war would've been v different had Elon not bought.