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I believe Instapaper also had a developer product they charged for, though I'm not sure how big of a share that had of revenue.

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Instapaper did not have a developer product that I'm aware of. It was a one-man product run by Marco Arment, and as I understand it, a successful one, but not successful enough to start employing a team of any real size.

It made most of its money through app purchases as the app was never free, and a small amount through subscriptions for a full text search feature that sold to a small group of the most active users.

I may be wrong on this, happy to be corrected. I'm going mostly off what Marco has said on his podcasts "Build & Analyze" and now "The Accidental Tech Podcast", which I have listened to on and off for a number of years.

Yup, they certainly did. Marco made Instapaper but eventually sold it to a different company (Beta Works) which built a team around it and monetized it via the developer api (https://www.instapaper.com/api). It was recently sold to Pinterest so that developer product is being sunset, but that's irrelevant in this example.

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