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