I would play it almost exclusively in a web design class I took. That class was where I learned HTML; that wasn't the focus of the class, not by a long shot, but it was the thing that captured my interest the most. I ignored everything else in that class in favor of the Wintermaul Tower Defense custom map.
https://www.thesixthaxis.com/2011/12/08/how-to-get-rid-of-th...
This happened a few times at LAN parties to my friends, some of whome gave each other the game by copying the install directory across. Took us a while to work out what the hell was happening.
I remember in Settlers 2 or something (before Ubisoft ruined it) the iron smelter was producing pigs in pirated versions.
However, it wasn't extremely good at detecting them leading to pissed off legit players.
One thing about Blizzard is they’re extremely litigious wrt to piracy and emulated servers. See WoW, etc..
Custom games and ladder were usually clear, besides map hackers in custom games. Every few months things would be wack (remember the enemy workers are sheep hack?), but it was pretty fair
They most certainly did in this case. This was for the private beta of WC3, not the fully released game. Most people migrated to official Battle.net when WC3 was released, I know I did. They really wanted to keep their private beta private and polish it without the entire world looking in on it.
Hundreds of thousands played. Blizzard released patches in beta that would, for example, spawn infernals to attack your town hall if it detected you were on the emulated server. This reminds me of that. Blizzard lost their battle, by the way, and people pirated WC3 all the way until release.