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by HomeDeLaPot 2039 days ago
If I had to guess, they're using the "places" that every user gets allocated. You can have a bunch of them, but only so many active at once. Maybe you can adjust the privacy settings for a place to allow only your friends. Roblox does all the hosting and provides the IDE (Roblox Studio) and everything. All the games on Roblox are somebody's "place" that they've made public and developed into a fun game.

This is from my own experience >5 years ago, so it could be outdated.