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Bittorrent basically runs on social norms, and people's willingness to help their community. Or people go to private trackers, where contributing is a requirement for being in the community and having access to its resources.

Blockchains are built under the assumption that everyone is selfish and untrustworthy. Which is a decent assumption when building a crypto currency, but that doesn't mean that every system has to run like that.

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As much as I like private trackers, very few use the ratio-less model to protect against serial leechers.

Typically on a tracker you’re given a currency (although not as sound as some e-coins) and can use that to influence your upload or download statistics, which in turn affect your ratio. Some trackers might employ rules where your user class has to have a certain ratio, or else you’ll lose privileges like certain forums or even the ability to download at all. (The trackers are private and can control which peers you can see)

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