If Safari was forced, you might be able to compare Apple and Microsoft. It's not, unless you fail to read the dialog, so charges of leveraging a monopoly position are bullshit.
Ah, my mistake, it is, of course, common knowledge that _all_ users read dialogues thoroughly before proceeding during an update... You are joking, right? Please tell me you're joking, otherwise it sounds like naivety or favouritism.
Unfortunately an awful lot of iPod users are frequently outwitted by various bathroom objects...
With Windows IE is present from the word go, it's something we're aware is there, it doesn't get installed by stealth some time later on, we can choose to use something else and in theory that choice should be honoured(in practice this may not be the case). Apple's updater is very different, a user installs iTunes, they get quicktime by the backdoor too but we'll ignore that, uses iTunes happily for months without noticing anything unexpected, always installing updates and patches when asked, along comes an update dialogue with a checkbox, user blindly accepts and down comes safari. Chances are that they've bought into the cult of apple anyway by this stage and there's a strong possibility that the new icon on their desktop will be met with some excitement.