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Battles, and Hard Work. Someone mentioned WoW below, it was the first widely popular MMORPG, the scale was dozen times larger than any previous MMORPG. And to get good or the fun, you have to join Raid and Guild. There were no quick way to do it, no Pay to win like we have today. Everyone joins and help each other in the Guild if you want to grow. And through having the Same Goal, overcome the impossible battles you have and hours spending time in Teamspeak ( Do they still use it today ), you form friendship.

It is much easier to have friendship when everyone have the same goal.