Roblox *used* to have this, note it's likely been nearly a decade since it's been removed, around the same time they killed off guest users as a feature. And minus the 'pay x tokens to get more' approach. Below 13 users by default, unless given parental permission, were only able to speak in a pick phrase from menu format, and I don't believe were allowed to see what regular users were typing. Essentially, Roblox was an entirely different type of platform back in the day and has ballooned into this horrendously overbloated proto-social media that links to all of the modern internet cancers, too. Another note, it's been around in some form since 2005 - back then I think it was invite only, but quickly became open sometime in 06. It was around at the peak of shit like neopets and club penguin, it's relatively ancient compared to a lot of the games that are currently 'in'.
Edit: I included a screenshot with this included in an earlier post today, but it was grabbed from someone's shitty youtube short. This is a more clear example of how it operated.
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While you could select down to a topic like is shown at the end of the list, it was so rudimentary you could actually select any of the 'topic' headers as speech. As in you could just say 'questions' or 'game' because they'd also made most of the others some form of response.