I mean, yes, this change makes them more money. But Apple is weird, because they are actually able to convince themselves that they're doing this for a good reason, and if you follow them closely you can almost see their central argument: when it comes to security, they trust nobody but themselves, not even the user they sell the device to. It's kind of a strange mindset, but if you look at it under that lens a lot of the concerns about sideloading and repairs make sense from their perspective ("we don't trust the user to do the right thing for their devices").

How does this look like from the outside? I think there are genuinely a lot of people who actually agree with this. Actually, I think almost everyone agrees with this to some extent: people only have a limited amount of effort they can spend managing different parts of their life. The conflict occurs for the parts where people do feel like they can make better decisions than Apple, but they can't because Apple won't let them. For most people, going to an Apple Store or AASP to get a repair is generally fine and saves them hassle. But for the people who are willing to save money to go elsewhere, or do their own repairs, it really sucks.