Yeah if I saw this just around with no extra info I'd probably ignore it. Maybe including pics of what games to expect would help. Obviously when posted on the sites you mentioned and others like Meetup you can be more specific, but vagueness hurts. Like I check the Meetup app for things in my area and the things I go to state what exactly is there (for gaming is was Mario Kart 8 Deluxe casually and others are movie groups where the film is in the title).

"Bring your own" probably also turns people away cause they don't know the crowd and might worry about things getting stolen or lost. Combine that with the vagueness and it comes off as nothing is available. Even the vague boardgame group I tried had examples in the title "Come play Uno, Rummikub, and more!" At least gave me an idea of what to expect with them.