[daveguy]

It takes a really warped interpretation of open source to claim MIT is a closed source license. Not even Stallman agrees with that. In his essay on selling exceptions to GPL he gave this argument[0]:

" If that implication is valid, it would also apply to releasing the same program under a noncopyleft free software license, such as the X11 license. That also permits such embedding. So either we have to conclude that it's wrong to release anything under the X11 license -- a conclusion I find unacceptably extreme -- or reject this implication. Using a noncopyleft license is weak, and usually an inferior choice, but it's not wrong.

In other words, selling exceptions permits some embedding in proprietary software, and the X11 license permits even more embedding. If this doesn't make the X11 license unacceptable, it doesn't make selling exceptions unacceptable "

It seems everyone except you, including the father of copyleft, agrees that the MIT license is a free and open source license.

[0]:https://www.fsf.org/blogs/rms/selling-exceptions

[pjmlp]

Other than I can take a MIT licensed project used to build my product, sell it and never give the anything back, not even the code.

Seems pretty close source friendly to me.

[opk]

And many open source developers are just fine with that. If someone finds a use for my code and even if they make lots of money off it then good for them. It's not like they've stopped me from using it in the original form. I've also had cases at work where we want to use open source and copyleft licences have caused clueless managers to get panicky despite the fact that we don't redistribute anything, only make use of it internally. They also often initially tell me not to contribute anything back but after the work is done and I explain multiple times about the effort of porting the changes to subsequent newer releases they agree (often with the proviso of using my personal e-mail). In summary, I don't follow the RMS line of closed source being morally evil or whatever so a license like ISC or MIT is the best practical match to my wishes when I release stuff.