17 days
they can even keep it proprietary if they wanted to.
Yes, with the caveat that it would have to be an internal piece of software, or if it’s a public facing tool then it would have to be under a non-copyleft licence. But yeah, for 99% of use cases they could have a proprietary fork.
Yep, or you can pay for the commercial version that has that feature built in. It’s up to you if you want to do the right thing or not.