J. Clarke wrote:

That's because Microsoft and Apple are not exactly monopolies: they
have robust and effective competitors. Their competitors are
themselves.

It's rather ridiculous to talk about "MS and Apple monopoly" given
that the two are arch-rivals and that Apple would prefer that no Apple
product ever run a single line of Microsoft code.

Uh, much of the code that runs on an Apple was written by Microsoft. For
example, MS-Word.