I’m very very interested in the business model used by @filippo since it seems like the lowest overhead, most humane of the open source maintenance outsourcing methods
Multiple companies pay him a retainer that is less than 20% of the loaded cost of a full-time engineer to keep a vital component of their product functioning but also to give their company two things:
1. Provide “reciprocal access” (more on this next)
2. Give advice on any area of his expertise