Not overly active but you could sub/participate in
Also !torrent_trackers@lemmy.ml (it’s more of a tracker listing community)
And right here in dbzer0 there’s !trackers@lemmy.dbzer0.com for general discussion as well.
EDIT: For specific sites / non-Lemmy you can monitor https://opentrackers.org, I kind of wonder if the admin ever made it over to Lemmy. On Reddit he goes by cuddlebunny and an earlier nick IIRC (but that’s all ancient info now probably).
It’s a nice gesture but I’m a bit doubtful that there’s enough people here to sustain a private tracker. Taking a guess at this but it seems most people here in c/piracy are general users, not specifically private tracker users - in fact a fair amount don’t even like the idea of private trackers.
!trackers@lemmy.dbzer0.com exists but it’s pretty quiet by comparison.
Not saying it’s a bad idea but it could be a while before a niche tracker like that would gain enough traction to sustain itself. And I’m just talking about a regular private tracker, not even going to touch on the idea of someone developing a “decentralized private tracker” whatever that means… TBH if you want decentralized just stick to public torrents with DHT/PEX, that’s already decentralized. Or maybe make a semi-private tracker like Demonoid if that’s more along the lines of what you want.