A vendor of web services, predominantly to enterprises & institutions.
I’m not trying to be obtuse here. For Apple it’s obvious: They’re a “gatekeeper” between software and hardware makers and iPhone users. If you want to offer your software or hardware to those users, Apple has to let your products through the gate.
If I make SSDs that aren’t the ones Amazon uses, does Amazon have to make it possible for me to use their data centers to rent those SSDs to enterprise customers via EBS?