If you release under GPL, are you prepared to hire lawyers to enforce the license terms? It's ok if someone isn't, but in that case, why bother?
>It's ok if someone isn't, but in that case, why bother? At least there is some sort of protection, and at least to scare away those who cannot afford the risk of being sued. Who knows, a lowly developer now might be able to turn things around and finally afford lawyers at his whim. Or even gain some backers.