SSH, OpenSSL, LibreSSL, pf …
There’s not a single web server without some code from them. Every single phone, every Linux machine, and probably even Windows (citation needed) ships with some of these tools.
And you didn’t hear a thing, because the OpenBSD guys just sport a smug smile and don’t care about our plebian fame.
No.
Interoperability is only required, if you have a significant market share. Apple does not have this in the EU. iMessage specifically doesn’t fall under this regulation, since hardly anyone uses it.
And since Apple plans to publish an SDK for their intelligence anyway, you can’t really regulate them for being too closed.
So either that’s a purely political retaliation, or their “super privacy friendly” services aren’t as privacy friendly as they claim.