What kind of reassurance have developers ever had that Apple won't pull the rug out from underneath them? It's a dangerous market, and has been from day one, be

What kind of reassurance have developers ever had that Apple won't pull the rug out from underneath them? It's a dangerous market, and has been from day one, because you do business at Apple's pleasure. When you build on a platform that is wholly and completely controlled like the iPhone/iPad platform is, the danger that the gatekeeper may change the rules or kick you out is an integral part of doing business on that platform.