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.
People seem to think that those who choose permissive licences don't know what they're doing. Software can be a gift to the world with no strings attached. A company "taking" your code is never taking it away from you, you still have all the code you wrote. Some people want this. MIT is not an incomplete GPL, it has its own reasons.
For example, OpenBSD has as a project goal: "We want to make available source code that anyone can use for ANY PURPOSE, with no restrictions. We strive to make our software robust and secure, and encourage companies to use whichever pieces they want to."
I don't get the whole MIT vs GPL rivalry. They both have their uses. If you want to use GPL, go for it. And if you want something like MIT that works too.
Thankfully both exist because I think we definitely need both.