Whether this is the correct thing for them to do is debatable, but it is not the behavior which got them in trouble during the early browser wars.
> There were no serious substitutes in the 1995-1997 time period that led to the antitrust proceedings.
Macs were just fine then, and they're just fine now. They couldn't run all important business software then, and they can't run all important business software now.
The situation has not changed much.