Wow, I had no idea the ARC source was open. IIRC, at the time PKARC and PKZIP were legendary, and the Sea guys got a bad rep from the whole situation. But reading that post and the ARC license now, it sure does look like Katz was a putz.
Exec-PC (huge BBS based in Milwaukee, WI) was full of anti-SEA propaganda in those days, which was just bizarre and I didn't understand why at the time.
I also didn't realize the code was open. If only we had github in BBS form in the 90s.