Oh, please. Non-GPL OSS developer here. I'm not some weak doe in the woods being preyed on by evil companies and their MIT and BSD licensed software. I know exactly why I strike the bargain I do - its because I want to be able to make money selling proprietary extensions and modifications on top of any software I write. And I want to encourage any developers using software I write to do the same.
I use BSD/ISC/MIT licenses because I support the right of other developers to make modifications to my software and keep their modifications closed source if they want. I support developers feeding their families. And more $ usually means more ideas, more developers and healthier ecosystem.
Get off your high horse. I'm not a "less principled developer". I just have different principles thank you. I think having developers who pay rent writing OSS is a great deal for everyone.