I personally don't play roblox, but my younger siblings do, and I just want to say that the reason it censors stuff is so that people don't say inappropriate things.
If it didn't, roblox would probably be super toxic. Just like every other video game and social media app people rant about on imgflip. Everyone would cuss and just say bad things in general; I REALLY don't want my little siblings to be exposed to that stuff, especially since they are all so young.