Roblox costs less money and those games are actually targetted at kids. Really, new games cost a lot and steam discounts on aggregate cost more.

Plus, competitive online pc gaming is something I dont want my kids near to. Mostly because of culture and addictive nature of it.

Speaking of addiction, worst are MMO like games, things like league of legends or world of warcraft. I dont want my kids to play any of that, these games tend to consume whole person.

Roblox is safe and age appropriate.