Roblox could be better moderated, the gambling stuff is actually a bigger issue on the platform, they should definitely do more to address and prevent the perverted shit.

But the perverts typically convince the children to download WhatsApp, that's where the actual grooming and manipulation takes place.
They target Roblox because of the fact that young autistic boys (the largest demographic that uses Roblox) are already socially isolated and nieve and desperate to make friends.
They target Roblox because the users are an easy target.