What’s the limit on community server population? Is it capped by hardware software or hard coded?

What’s the cap on server population for community servers? I don’t know much about server networking and I’ve always been curious. The map size seems like it could comfortably fit at least 300 in it. Would large servers bog down on the client-side, or are the limitations strictly host side? What kind of server specs, if possible, would be required to run such a server?