Minecraft! Yes, PMC exists, but... It would still be nice to have here for the people who don't want too many accounts. My suggestion would be to limit the content to not include downloads, so PMC remains the center for that. Minecraft screenshots and art sharing would be nice to have a planet here for.
Terraria!
Some other sandbox games that I have, people may want to share screenshots and art of, a few even allow mods and build download sharing: Animal Crossing NH, Stardew Valley, Dinkum, House Flipper 1 & 2, Town to City, Planet Zoo, etc. There's a lot of sandbox games!
