The solution has been throughout the ages, content moderation and community policing. The village used to be that. We were promised the Global Village, but got the Global Content Farms.
If you can't run forums and chats because moderation is too expensive, then don't run 'em. Roblox is like the Pleasure Island in Pinocchio.
Wasn't pedophilia much more widespread throughout the ages than it is now? I think the real "solution" to the problem of child abuse back in time was not to view it as a problem at all!
Whatever it was, it was highly context dependent and distributed thus more resilient to the whims of a single commercial entity. Roblox is like centralized daycare. If you are fine with that, sign your kids up.
But I didn't say anything about roblox, why do you think I'm fine with whatever they are doing? I just think you are wrong to think that anti-pedophilia guardrails thorough the ages were good and should be example for us. If you are fine with how things were done, sign your kids up for marriage and pregnancy at 13 years old.
If you can't run forums and chats because moderation is too expensive, then don't run 'em. Roblox is like the Pleasure Island in Pinocchio.