> However, if my continued use of a specific version of your software has no continued cost to you

That's just it, it does carry a cost, at the least for security updates and allowing the application to continue to be installed on later OSe or key libraries.

That's why even open-source libraries that in actively being used will get forked if unmaintained too long, because there's always something to do to keep bitrot at bay.

I don't expect that my current version of the software will be updated forever or remain indefinitely secure though. I expect that I'll get some small updates or security patches for a certain amount of time only and I'm OK with that. If something comes along that I can't live without, or the platform breaks things sufficiently, then I pay for the upgrade at that time.