A locals casino is a land-based venue aimed at residents rather than tourists. The term comes from Nevada, home of Las Vegas, where it separates casinos built for local players from the resorts built for visitors. First-time visitors often look for glamour and scale: lavish lobbies, famous restaurants and grand gaming floors.
Locals have seen all that many times. They tend to choose venues that compete on the gaming itself, with better odds, lower minimums and a wider choice of games. Players call these places locals casinos and the others tourist casinos. The idea carries over online. An operator that focuses on one market, with local payment methods, local language and promotions built for that audience, is in effect building a locals casino.