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There is a lot of work post launch in customer support, fixing security issues, keeping code up to date, and fixing bugs.

• teiferer 6mo ago
  The author wrote explicitly that they want to be compensated because they spent weekends writing the thing. Any customer support that has to do with payments and license checks doesn't count. Once you have a community of interested folks then fixing security issues and keeping things up to date is much easier. If there isn't enough interest then there isn't much of a monetizeable customer base anyway. It's self-regulating.