I've played many many hours of Roblox with my nephew, and I've yet to encounter anything close to what this article is talking about. I rarely talk in that game, so I'm essentially indistinguishable from a child to any predators.

I've heard plenty of inappropriate language (almost exclusively simple cursing), but that's about it.

I don't want to discount the content of this article, but I agree that it's more likely "just one of a thousand realms where kids might encounter danger, but usually do not."