Most multiplayer games use peer-to-peer networking as a cheap and easy way to connect players. Running dedicated servers and writing the accompanying connection code is costlier and requires a greater degree of developer involvement with a game, post launch. If you play Overwatch or any of the Call of Duty franchise, then you’ve experience multiplay via this technology. It’s cost and convenience are offset against its technical weaknesses. The player that hosts a game has a potential speed advantage and if they quit the game will pause while a new host is found among those still playing. Then there are exploits and cheats that can be used by unscrupulous players such as lag switches and DDoS attacks. Thus, P2P networking is far from an ideal alternative to dedicated third party hosts.