[TinkersW]

A really messy and ugly game that lets people make & distribute mods for it, somehow popular with children, despite being a complete mess.

[AnIdiotOnTheNet]

I haven't played roblox and know relatively little about it, but my guess would be that it is popular with children because it has a low barrier to entry. Sort of like what Flash did for young animators.

[tenaciousDaniel]

I played Dreams on the PS4 before I had heard of Roblox, and when I first heard about it I thought "oh wow it's probably like Dreams but for PC!"

I was sorely disappointed - I'm as perplexed as you are how they became so successful. It is indeed a total mess.

[wvenable]

Kids love the total mess! As an adult I don't see the appeal but I can understand why kids like it. Most of the complaints here about Roblox and revenue sharing, etc, completely miss the point: Roblox is not Steam; it's a playground.