Nice one, not sure why it's geo restricted to the US, Canada, and Europe though, unless that's a limitation of the bridge software they're using. Could be a pretty neat selling point for a small subset of users, but I don't think it'll make people reconsider which Android they choose to upgrade to.
Also nice to see e2ee RCS implemented outside of Samsung and Google's apps.
For anyone looking at alternatives, there's AirMessage (if you have a mac, real or virtualized), and Beeper (not free, in any sense of the word, but supports even more messengers)
Its not really a problem being restricted to the US and Canada since they are the only countries having that 'problem'. No one uses iMessage outside of the US.