If I can sideload apps on an Apple device, what's stopping me from buying a bunch of them, sideloading my special apps, and reselling them at a markup? Or, if t

If I can sideload apps on an Apple device, what's stopping me from buying a bunch of them, sideloading my special apps, and reselling them at a markup? Or, if the bootloader becomes unlocked, wiping iOS off of the device and installing Android? There's no way to even have other suppliers right now because Apple has everything so locked down.