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No it's not. Running a service costs money. That money has to come from somewhere. Google makes that money by spying on people and using that for ads. Apple makes that money by selling hardware. You're saying that both companies should be required to provide the services they render, but apple's model of paying for it by selling hardware should be banned. Also, go talk to someone who has bought a new car, and ask the…
I do have a spare iPhone in a drawer, still works and can message on iMessage. There, I have purchased Apple hardware, now can I use iMessage on my Android phone?
For the same reason that if you buy a game for xbox, and then when you later buy a playstation you can't turn around and demand that MS port the various xbox services to the playstation, or a publisher port an xbox game to playstation.