You are wrong. Child predator activity is a priority for Roblox. Their corporate team has stated that if you investigate child predator activity, you will be banned immediately.[1][2]
The virtual world called Second Life, considered similar to Roblox, also has a rampant child predator problem[3]. It is interesting because Second Life and Roblox are similar 3D worlds. Both experiences have a similar visual feel. Both experiences do very little KYC, resulting in a rampant alt problem. In fact, Second Life will begin using the same version of Lua used by Roblox, so in some ways they are even technologically-related 3D experiences.