I think this comparison is in bad faith. I would put it like this, it should definitely be illegal to be anti-competitive on general computing devices once you

I think this comparison is in bad faith. I would put it like this, it should definitely be illegal to be anti-competitive on general computing devices once you hit a significant revenue(the revenue bit only to allow small players to compete first and not be stifled). Devices like Kindle are one purpose devices. It is supposed to be a replacement for a book. The integration with Kindle Store for ebooks can be complained about, but Amazon gives you the freedom to use ebooks from anywhere, infact if you can live with the bad experience you can use the browser itself to download them on the device. iPhone is a different ballgame, it is an ecosystem creating device. I have no problem with them restricting the APIs for third party developers if it improves security on the device, that's a good thing. But then the rent seeking on apps like Spotify is just bad for upcoming companies and would be for users in the end. This is not just limited to software, they can use the same leverage to even kill companies in hardware space. Sure, Apple doesn't have a monopoly in terms of device share, but they absolutely are in a position to kill a company.