Oldschool runescape might be a good section to have. I'm not sure how many other Smg members play it but it has been gaining popularity.
Runescape 3 came out on steam recently and OSRS is set to come out on steam next year.
https://store.steampowered.com/app/1343400/RuneScape/
OSRS currently has 140-160k players online at peak hours so it would be the 4th most active game on steam
https://store.steampowered.com/stats/Ste...Statistics