Comment by perihelions

You can read the text of the GPLv3 license itself; it has a specific provision for this case.

> "Moreover, your license from a particular copyright holder is reinstated permanently if the copyright holder notifies you of the violation by some reasonable means, this is the first time you have received notice of violation of this License (for any work) from that copyright holder, and you cure the violation prior to 30 days after your receipt of the notice."

https://www.gnu.org/licenses/gpl-3.0.html