I think what Facepunch really wants out of s&box is a way to stop having to pay Unity millions of dollars to use their engine for Rust and future projects. The Roblox like platform that is also part of s&box is mainly just a way to get a lot of cheap play testers into their new engine so bugs and other feature requests get surfaced way faster.
I can’t image they really care if people play the mini games or use their editor to make games beyond that. Best case it gets a fraction of the popularity that Roblox has and it might turn into a revenue stream for them, worst case they still get a bunch of people to play test and use the engine editor organically so they can see where they need to focus improvements on.
Facepunch isn’t hiding this either, Gary has said it himself directly that they want to get off Unity at some point not only to save money but because Rust has gotten to the point of outgrowing it and Facepunch engineers end up needing to do work that Unity should technically be doing to continue to improve it.
I’m only saying this because of all the negativity around the initial release, it seems like a lot of people were really disappointed this wasn’t a gmod 2 or that the engine editor isn’t at feature parity with something like Unity yet. I don’t doubt that it will continue to improve, but I also don’t think the main focus of s&box is to make the mini-game section really great. S&box will be a major success for Facepunch if they are able to eventually port Rust over to it and have their developers use the engine editor to make new games going forward, so I’m not expecting much from the actual gameplay.