it looks like they wrote more in that post than they have code. that's an empty repo lol

Federated games? Is it like servers talking to each other to show each other on the list, in this case?

pretty cool

more alternatives are cool but no free hosting is a turn off for me. the biggest advantage of roblox was how easy it was to make a game for my friends in seconds. regardless of that i'll still keep it in my mind.