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Samsung joins Google in RCS shaming Apple
(www.theverge.com)
This is a most excellent place for technology news and articles.
Under new EU laws, Apple will be forced to allow interoperability with iMessage in the future. That doesn't necessarily mean them adopting RCS or bringing iMessage to non-Apple platforms, but it does mean they'll need to at the very least publish an API allowing external software or services to use iMessage.
I just expect them to make the interoperability as shitty as possible
I think they found imessage not to be a leading platform so AFAIK this isn't the case for now. Maybe if more people start using it they'll revisit the question.