You might have been able to get free invites by posting your email in IRC about fifteen years ago, but nobody does that now. Now you need an interview or a profile from other trackers along with your stats.

here a free semi private tracker (always open tho just need a code) for 0day release

milkie dot cc (invite code: BestCowsHere)

Not everyone will start using it just because the price is right, it is a subscription. Also, not everyone wants to stream and forget. There will likely always be seeders of public torrents available especially for popular or mainstream content. You can always revive a dead torrent if you have access to private trackers, usenet, ddl filehosters (debrid supported)