Did the licens for gantz expire
i was wandering if gantz license expire if it did do you think you wood get the show back?
No, FUNimation still owns the rights to Gantz. They've just never had streaming rights for it.
The physical release is still in print, so you can buy it, but you just can't stream it anywhere.
A few other shows are like that, such as Tsubasa and YuYu Hakusho.