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To update you need the data so you can rehash it. A typical tracker only has the torrent files and would take a very long time and spend a lot of possibly expensive bandwidth to download all the tracked torrents. And some torrents may not be seeded all the time.

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If nobody has the data, the torrent is effectively dead and most private trackers will remove it in time. If it's not dead, they can incentivize seeders to re-hash/re-upload a v2 compatible torrent if they really wanted to.

Private trackers tend to gamify quite a few aspects of their sites (obvious example being the seed ratio itself).

They often just have the magnet links. I haven't looked into how that works, but I think the complete data is only on the seeders' machines, and the torrent propagates through DHT.

Private trackers do not use magnet links afaik.

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