Context:
Permissive licenses (commonly referred to as "cuck licenses") like the MIT license allow others to modify your software and release it under an unfree license. Copyleft licenses (like the Gnu General Public License) mandate that all derivative works remain free.
Andrew Tanenbaum developed MINIX, a modular operating system kernel. Intel went ahead and used it to build Management Engine, arguably one of the most widespread and invasive pieces of malware in the world, without even as much as telling him. There's nothing Tanenbaum could do, since the MIT license allows this.
Erik Andersen is one of the developers of Busybox, a minimal implementation of that's suited for embedded systems. Many companies tried to steal his code and distribute it with their unfree products, but since it's protected under the GPL, Busybox developers were able to sue them and gain some money in the process.
Interestingly enough, Tanenbaum doesn't seem to mind what intel did. But there are some examples out there of people regretting releasing their work under a permissive license.
Yeah, duh. Intelligent people read licenses before they pick one.
That's like signing a contract before reading it and then complaining that it contains provisions that surprise you when they are enacted. I'm baffled on a regular basis by how many people understand FOSS licenses only on the basis for hearsay, for example when people insist that GPLed source code must be made available free of charge for everyone. The GNU project has a FAQ about the GPL that spells it out that this is not the case and yet hardly anyone discussing FOSS licenses has even read the FAQ.