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I played Roblox in the past (like 2012?) and it did have one called Safe Chat. It got removed in 2014 according to here.

The wiki says it was replaced by a tool that kicks on for everyone under 13 that only lets them use words from a very specific whitelist.

If they don't do this already they need to divide the player bases. Want to play in the <13 rooms? You have to use the same word whitelist they have.