Factorio (actually not sure what the MP limit is without mods; but I know there’s a mod that makes it infinite due to seeing the Spiffing Brit playing with like 300 people at once).
EVE Online (the bigger your group the stronger you’d be. Get 100 of 'em; start your own corporation)
Actually while thinking about what supports more than 4 it’s mostly creative games and MMORPGs (that know of). Damn near everything centers on groups of just 3-4 with the exception of the 5v5 competitive shooters.