If my mom buys an iPhone and then finds out two years later that it was a mistake, at that point she probably has a bunch of apps she'll have to re-buy on Android (Apple gives developers no way to offer cross-buy like this), and she may need to switch providers for things like e-mail or messaging if she was relying on Apple's email service or iMessage. This creates a lock-in effect because not everyone can afford to drop a bunch of money to leave the walled garden.
I think in general people like you or me are savvy enough to not get harmed by these Apple policies, but court cases like this are about protecting everyone.
This could be true, but is there any evidence for it? I have a ton of apps. Very few cost more than $5. Most were free, though sometimes with a paid-for service (e.g. Dropbox, Evernote) - which I would still get if I changed platform. If I claimed this lockin wasn't a serious problem, could you prove me wrong?
I think in general people like you or me are savvy enough to not get harmed by these Apple policies, but court cases like this are about protecting everyone.