"It seems to me that the developer of a free program is the only one who has
disadvantages due to a permissive licence."
Actually, with a permissive license, it's the other way around: The developer
still has the source code and so has lost nothing. The users are the ones
that have lost out because the developer doesn't pass on the source code and
the freedom.
"I can't understand why anyone wants to release something under this licence"
In my experience it's those that actually *like* the idea of their program
becoming or proprietary or, at the very least, don't see anything wrong it.
They only evaluate "first level effects": How it affects the developer, not
any "second level effects" about how it might impact the people using the
software. I think of it as short sighted and/or careless, depending on the
person and their viewpoints and reasons for using the license.
