My reply was in response to a comment about alternatives. Just because IE was included with Windows didn't mean end users had to use it or couldn't download alternative browsers (or browser engines) such as Netscape Navigator, or use Netscape Navigator on alternative Macintosh, Linux, etc. machines. Again, the availability of alternatives did not and does not eliminate the possibility of related antitrust violations.
As far as Apple is concerned here, in various ways they are even more restrictive than Microsoft was. Apple not only restricts alternative app stores, browser engines, sideloading, etc. on iPhones/iOS they sell and those sold by third party retailers like AT&T, Best Buy, etc., but maintains similar restrictions on what end users can do.