Why do you think it's limited to the FOSS world? Surely most SaaS companies (and certainly the most profitable) are business-to-business companies, and presumably they're quite a lot more valuable than the average library vendor. I would also hazard a guess that onprem services occupy an intermediate tier both in terms of profitability and in terms of integration model: they're a whole service (as opposed to a lib) but the customer is on the hook for integrating and operating (as opposed to SaaS).
