The owner of the client. For example, you, in relation to Damus. Just like they did with Pavel Durov. They'll say, "Will, shut Damus down or we're putting you in a cage". As a client operator, you need to prepare for that. Because eventually, it's a very likely scenario if Nostr takes off. This is a war.

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Jailing me would do absolutely nothing. Damus is open source and doesn’t require any supporting infrastructure
Free and open source is the key here. Anyone can run or modify the code and just carry on.