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Re:Tokyo’s Manuscript Writing Cafe won't let writers leave u... by ars on Thursday April 14, 2022 @06:46PM (#31034381)
There's a startup that did this, they posted on here about it, but I can't seem to remember how to find them.

Found this: https://news.ycombinator.com/item?id=20220288 but they don't seem to have survived.

Re:Tokyo’s Manuscript Writing Cafe won't let writers leave u... by throwanem on Thursday April 14, 2022 @09:01PM (#31035527)
Beeminder? I've seen them mentioned here a time or two, and iirc they use a not wholly dissimilar "do the thing or lose some money" model.