[jnbiche]

I've done this twice with GPL code, when I was writing a library and/or library bindings that I specifically wanted to be available for use by all developers, including those working on proprietary products. Both times I've been turned down. One of them was a abandonware. Great C code that the author explicitly disowned. Now it will bitrot.

On the other hand, I have asked several developers who released code without a license if they would mind licensing their code under a permissive license, and each time they have been glad to do so.

Just some anecdotal data...