Is Apple obligated to ship an iMessage client for other platforms? For free?

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Open secure messaging protocols with freely available and unencumbered specifications and even implementations are good, actually.

I wish XMPP or Matrix or whatthefuckever existed so that we didn't have to rely on fifteen fucking proprietary IM systems to communicate with an adequate portion of our friends.

Can we make it an outright criminal offense to ship a new messaging application without an accompanying RFC detailing the format? With aggravating circumstances if you outright forbid third party clients that end up being created anyway.