There are some strategies for monetizing online game servers. For example, if you have a popular server, you can charge for access, premium content, or in-game items. You can also run ads or sponsorships. Users might even donate money to you if they like what you’re doing.
That said, it’s tough to cover hosting costs and earn a lot of money over that. It can make a nice side income, but it’s tough to get rich without a gargantuan server network.