1) well you didn't PAY for it!! they don't owe you anything!
2) well nobody was PAYING them. they don't owe you continued support!
one of the applicable legal concepts here is "attractive nuisance"
It is perhaps even clearer to say: you can't put poison in sandwiches, leave them on picnic tables, and then claim "well I didn't owe anyone anything! they never paid me for those!"
what should they use? they have jobs. they need to accomplish them. their bosses won't accept "well the guy who makes this is doing it for free" - that will get a brisk "so?" and if they decline, they'll be fired.