Why would Apple want to spam the Amiga forums, they don't think in terms of hundreds of people, they think in terms of thousands or millions, the 1200 people they have at Amiga.org is probably their daily returns, (old mini macs).
Well, that's basically the point, isn't it? Apple couldn't care less about MorphOS users ('smatter of fact, they'd probably be less upset about them than they would be about the people who are still using MacOS on PPC Macs, as there's no way MorphOS users could be construed as lost sales for x86 Macs the way PPC OS9/OSX users could if you look at it cockeyed enough.) So they continue on not giving a tinker's damn, and MOS users keep doing their thing, and nobody is the slightest bit upset about it, save for you.
CUSA, on the other hand, doesn't have any market
but retrocomputing enthusiasts (oh wait, I forgot, there's those tens of thousands of Wal-Mart sales that are probably coming Real Soon Now,) so they spent years spamming Amiga forums to try to convince people that they are the True Future of the Amiga (and for "try to convince," read "declare insistently and verbally abuse dissenters and holdouts.") And naturally, people were a little upset about that.
And that, to answer your question, is why nobody complains about Apple the way they do about CUSA: Apple hasn't given us (personally) anything to complain about, because they don't care or probably even
know.