Because we might find people that leech of others success annoying, when they put next to no work in.
So FSE leeched off Tale World's Warband game?
Every film maker leeched off the guy with the idea first?
Scientists leech off of each-other whenever they improve something?
Tale Worlds leech off other games companies which leeched off the first game?
FSE also leeched off the Napoleonic wars, they're so unoriginal.
The list could go on forever. Just because someone else makes a GF server it doesn't mean you can go on it and start flaming it for copying your idea. I've never seen 91st flame Melee_Groupfighting, at least this server has very good maps and gives a place for people who often fight with swords to practice. I quite like the look of this server, actually