as I have tried to start a business building on top of API's, this is in general a risky business. Not only can they disappear, but also work incorrectly, go down, change overnight without notification. Also your access can be shut down just because of a change of heart on their side

If you don't pay for access and have some kind of contract (Twitter firehose, Bing API), yes your business goals are not aligned and you'd better prepare for the worse.