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Re:IRC.com Bought by London Trust Media, Pledges an IRC Revival by rasengan on Saturday June 23, 2018 @07:01AM (#17380613)
Signal requires a phone number. Keybase is an identity service. iMessage requires a phone number and is not verifiable.

IRC on the other hand allows ephemeral usernames, you have the option to use e2e encryption if you choose, etc.

Re:IRC.com Bought by London Trust Media, Pledges an IRC Revival by kemayo on Saturday June 23, 2018 @12:54PM (#17382099)
iMessage doesn't require a phone number. You can use it with just an email address.

I mean, you do need an Apple ID to do it that way. But I don't think there's anything stopping you from creating throwaway Apple IDs.