Apple doesn’t have sufficient market share to be considered a monopoly. That’s generally how they’ve skirted around the issue, and by positioning themselves as a premium brand, they can raise prices on their hardware to the point that market share remains sufficiently small to not be subject to monopoly laws.

At the time of the MS/IE lawsuit (2001), Microsoft Windows had well over 95% of desktop operating system market share.

Fair point.

Because the DOJ suit against MS was misguided and unnecessary. It had little effect on eroding Microsoft's supposed stranglehold on the browser market. When browser monoculture began to really hurt consumers and innovation the market found solutions through improved collaboration (W3C getting its act together, and developers embracing web standards), business model innovation (mozilla foundation embracing open source vs. Netscape charging $40 for a commercial license), and better technology and industry/community collaboration (khtml and webkit). Even some eventual deadends like Flash played a role at the time in routing around the untenable, but very temporary, situation of IE v.4-6 dominance.

Edit: I want to add that during the suit MS reps had a glib but prescient defense: "we think web browsers should be free". They meant as in beer, but they were right in the larger sense, and few would disagree with them today.

Netscape was arguing that their by-then totally crappy commercial browser deserved protection from the state, when their demise had a lot more to do with insane bloat and their embrace of groupware.

The big differentiator here is that Microsoft had a dominant monopoly on PCs. Apple is a huge huge player in the smartphone space, but they're still in no danger of having a majority of the market.

Microsoft got in trouble for licensing deals: strong-arming OEMs to force them to bundle Windows. Apple doesn't license iOS.

The issue with the browser (and sideloading) is security. Browsers by their nature are essentially apps that run arbitrary code from an unknown location. How do you ensure security of the devices if you don’t control the browser?

Safari is great on iOS. I’ve never felt the need to run something different. Same with sideloading apps. I’ve never seen the need for that. Maybe I’m an Apple fanboy but I think they’re doing the right thing in both cases.

Apple doesn't have the market share MSFT did back then.