This, btw, is why open sourcing proprietary software rarely happens: you actually have to go to a fair amount of careful effort to get it right. If you don’t, you end up with this debacle.
Well, of course you will have to be the more careful when open sourcing proprietary code, the more you illegally used copyrighted code earlier.
Not really. The reason in this case is that they wanted to share the source code exclusively for direct collaboration under their own direction; so they wrote an incomprehensible and incoherent license, and gave up after everyone called them out on their bullshit.