You can write any conditions you want into a license.
That's what actually differentiates proprietary licenses from open-source licenses.
Open-source licenses follow certain rules, and you usually select an existing license, so therefore they can be reasoned about, collectively. People often implicitly mean "OSI-approved license", when they talk of "open-source licenses".
Proprietary licenses, on the other hand, can contain whatever bullcrap you want.
Having said that, I'm not a lawyer, but I imagine, if you also called your license "GNU General Public License", then a case could probably be made in court, that your license is deliberately confusing.