That’s the point. It’s not Apples problem. Apple supports basic carrier messaging. If someone buys an Android, Apple users can message them just as anyone who buys a Windows Phone or BlackBerry.
It’s either an Android problem — getting fragmented service and no E2EE — at which point don’t buy an Android; or a user preference problem — “Inprefer iMessage” — at which point buy an iPhone.
Vendors on both sides have gone up and down the market to cover the spectrum, it’s not even a “can’t afford the premium feature” problem anymore as it were decade ago.