This in itself is false. I can build an App on my machine and install it on my iOS hardware, admittedly with Apple's blessing (certificate). Also, companies can build their in-house apps and distribute them to employees' devices. The limitation comes into place for developers distributing to an unknown wide audience. You can argue this is bad, but I fail to see how several stores (or direct download) would actually benefit the end user.
Apps Apple doesn’t like, allow, just because, etc…. would be available for the user.
Many devs have been victim of Apple’s capricious decisions.