These are the rules for cloud chat projects, as stated here.

dietbacon wrote:
What if my cloud chat uses a whitelist of acceptable words?

We will be removing all projects we see with cloud-chat functionality, even if they have whitelists.

What if I make a chat project that has other safeguards built in or rules listed in the instructions?

If others can type or enter their own responses, it still violates this policy.

What about projects that allow people to share emojis with each other, or that use a few pre-made sentences?

These are generally fine as long as they can't be used to share content that the people viewing the project can create themselves.

In short, if your cloud chat lets other users create their own sentences using letters or words, then it's not allowed. But if an user cannot create their own sentences and only use words and phrases individually from eachother, then it is allowed.