If your software has million users, cudos. Regarding monetization: - either you developed said software as an employee, than you were properly paid for it and

If your software has million users, cudos. Regarding monetization: - either you developed said software as an employee, than you were properly paid for it and it is not content - your user bought liscenses from you for whatever conditions you agreed upon - you sell it as a SaaS, and you get monthly subscription fees - you give it away for free Obviously, all those payments end when the conrtact with your customers end. If your next of kin runs the software 90 years from now, and customers still use it, of course cuatomers will pay, or not, as laid out above.