First appearing in 2008, the Roblox guest feature allowed new players to test the game out before making an account. Guests were limited in what they were able to say, and in later updates they were unable to read any chat messages at all.
In 2017, Roblox made it so new players could only become a guest 20 times before being forced to make an account. This period lasted between June and October before the guest feature was pulled entirely in October 2017. There were methods available to play as a guest character, but these were all removed by November 2018.
This chat-limiting feature was known as Safe Chat, but this was removed in 2016 which stopped guests from speaking to anyone. In 2017, Roblox made it so new players could only become a guest 20 times before being forced to make an account.
Guests were allowed to interact with the Roblox world and play some games, but that was about it . This feature was useful for allowing players to judge how well Roblox runs on their system before committing to the game with an account. Guests were unable to chat to other players, play in any games with their friends, purchase items, ...
Guests were unable to chat to other players, play in any games with their friends, purchase items, provide feedback, and they were not allowed to save any progress within games. Being able to play in some games meant guests could spoil the fun as they were unable to communicate effectively.