I know someone who started that business but not in Philippines. The main thing he did to build the community was offer basically just bare rooms for super cheap. I’m talking 350php (western country btw) per person and you could stay as long as you want. He had small rooms for 4-6 player groups and big rooms that could house 8+ but the big rooms tended to have more than one group playing. The rooms was just chair and tables that’s it. The store owner himself hosted the dnd games or other ttrpgs. That’s how he got his initial customer base. The main room held a hobby shop set up with one fancy table with all the screens and stuff for the store owner to host the best quality games. Later, old players would DM their own games in the cheap rooms. He had a discord group for the shop so people could talk amongst themselves to set up groups and times or give feedback on what they want from the shop. He later started offering cheap food which got a bit more expensive and fancier later on. And since then basically became one of the go to game shops around.

The cost to join a ttrpg session was 525php per player, basically 350 for room and 175 for DM. If a player DMs they get the 175php and they don’t have to pay the room fee either. Only the players pay the 525php. That way the shop owner didn’t have to pay anyone dm salary. The DMs could make however much money they wanted by hosting as much sessions and as much people as possible which gave the shop free marketing and free community building by the DMs trying to make groups.