Building Your Business on a single API is dangerous

I see a lot of posts about people complaining their business was killed because their only single feature was they used an api.

Isn't this building your entire business by parasiting on a single host?

Personally i would have a fallback at every step so there was no single point of failure.

But using linkedin as your only source of data means your business is one gamble to see if they will allow you.

Why complain to the company when they block you when you knew you were taking a risk and the way a tick parasites on a dog the source can be cut and you will die.

Just think before your entire plan is to use one single point of data like facebook, craiglist or another place you dont own because you are taking a gamble.