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Session was recently shut down due to lack of funding.

True P2P implies knowing the IP addresses of the people you're talking to.

Or it can be many-server, with tens of thousands of server operators and one selected at random.

Only the server operators then know your IP, and they don't know who you are or what you're saying.

Yes, Session was shut down due to lack of funding for those servers.

Session was supposed to be shut down at start of July but looks like they got enough funding from donations to keep going for now.