Pirate Bay is a great tracker of last resort .. and when I look for something rare I can't find on a public tracker, it usually showed up on Pirate Bay.
Even before the pirate bay became a vague concept often repurposed by people trying to sell dubious VPN services or mining cryptocoins with your browser they had already ceased to be a tracker. Those are just indices! They'll suggest some actual trackers on the magnet URLs in their listings but you can get comparable results using a DHT search engine.
You can intersect here "trackers" that are "public":
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