> I always assumed this was the case anyway; MIT is, if I'm not mistaken, one of the mostly used licenses

No, it wasn't that way in the 2000s, e.g., on platforms like SourceForge, where OSS devs would go out of their way to learn the terms and conditions of the popular licenses and made sure to respect each other's license choices, and usually defaulted to GPL (or LGPL), unless there was a compelling reason not to: https://web.archive.org/web/20160326002305/https://redmonk.c...

Now the corporate-backed "MIT-EVERYTHING" mindvirus has ruined all of that: https://opensource.org/blog/top-open-source-licenses-in-2025