Interestingly enough, Tanenbaum doesn’t seem to mind what intel did.

Yeah, duh. Intelligent people read licenses before they pick one.

But there are some examples out there of people regretting releasing their work under a permissive license.

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.

Someone please SUE ANYCUBIC AND CREALITY FOR STEALING KLIPPER !!!!!!! Make them give back to the community that created their business !!

Permissive licenses are truer to the spirit of free software but copyleft, while kind of a copout, seems more pragmatic due to corporations. I wouldn't avoid copyleft licensing on principle or anything but it feels incongruous to want to make something freely available to all but then nitpick over how they use it.

I find MIT to be good for libraries as you can get companies using it and working on it. However, apps and binaries should be copyleft to not get fucked over.

Busybox was quickly replaced by BSD-licensed Toybox everywhere for that exact reason.

Copyleft licenses (like the Gnu General Public License) mandate that all derivative works remain free.

This is false. It's perfectly legal to take GPL-licensed work, modify it, and sell it. As long as the work itself does not reach the general public, you don't need to release it's source code to the public (e.g. your work for the military, you take money for your work, and provide source code to them, but not release it publicly).