> IMHO if he has a problem with the way things worked out, he should have chosen a different license.
This is a classic conflation of legalese and ethics/decorum/professional courtesy. Just because something is legal doesn't make it good, and just because something is good doesn't make it legal.
For example, I abhor those who take credit for other peoples' work. But I use a license on software I write that permits folks to do just that.