- But you gave it to me!
- It was for free, so don't dare you to complain
If it was given with the (maybe implicit) clause that there was no limit of time, I don't see how the thing being free give you the right to take it back, especially from people who have used it to build something. Sure the first act was charitable, but in the end you cause more harm than good.
Relying on something continuing to exist on the internet, without making your own backups of it, and you're going to have a bad time.