You weren't around when SEA sued Phil Katz over the ARC format?
On the very day that Phil released the first version of PKZIP, he published the full specification for the file format and announced that it was available for ANYONE to use it.
Bulletin board sysops were so POed over SEA that they converted everything to ZIP as quickly as they could manage. Within six months, it was hard to find anything but zip.
RIP, Phil, and thanks for all the fish.