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A whole lot of people commenting on HN suffer from that sickness.
The answers to the questions I suggested help decide whether it's driven by creating value for customers or yet another manifestation of the parasitic "extraction" mentality (aforementioned "sickness").
I even quoted the part to which I was responding, yeah?
Yeah.
A public API is going to incur additional testing, documentation, and support. Charge accordingly.
I like the analogy of a restaurant. API is sort of like takeout order, here is your food packed in a bag now do whatever with it. Not having a takeout option means customers are stuck with whatever service you provide in the restaurant.