You can make rules in the rule block editor to add up each team's kills and award a winner based on most kills for deathmatch servers. For objective-based servers, you can make objectives and win conditions, but it's a lot of effort, and the rules bug out and do unexpected things when things get complicated. Real buggy and not very friendly. Would be nice if they just published all the official maps and game modes as 'verified' portal content.
Just saying, it is possible to make spawns and win conditions. You can make a semblance of a game. It just takes effort. And that's the thing that sucks; because no one joins the server anyway 'cause of the XP nerf. Dead on arrival. Or, 2 weeks after arrival, on purpose.