One game that went into Early Access a little while back had the most ghetto multiplayer setup I've ever seen in a game released to the public for money. In order to play multiplayer, the host game would generate a URL and then the host would have to post it to the other players via some kind of external chat, who would then have to copy and paste it into their game clients to connect. There was no in-game means of communicating this to players, no in-game chat, no lobbies, no matchmaking, nothing. There is no way that this implementation was somebody's "final" solution, but they somehow felt confident enough to launch Early Access with it and charge money for it.
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