Yes and no. There is a risk on building your business or app on somebody else's platform, but there is also risk in investing your time and resources on trying

Yes and no. There is a risk on building your business or app on somebody else's platform, but there is also risk in investing your time and resources on trying to recreate the same stuff (and be stuck maintaining it) rather than on your true core business. AWS is quickly becoming the standard runtime to build your application on top of (like win32 was in the 90s) and for a lot of scenarios the rewards on building on top of their platform are bigger than the potential for lock in.