My girlfriend's sister (was ~10 at the time) is now banned from Roblox because she kept getting sucked into ERP with people in game. Safe to say, the mother wasn't happy when she saw some of those chat logs...
Minecraft is the replacement - no IAPs (as far as I know), online community is pretty varied but pretty decent for the most part, and the game is lots of fun even completely offline.
Roblox has a nice parental control system, and is totally playable with chat disabled (and the preference password-locked with a special parent-held password).
Minecraft is the replacement - no IAPs (as far as I know), online community is pretty varied but pretty decent for the most part, and the game is lots of fun even completely offline.