Is there a general chat service without registration and SMS?

Question

Chats

You need a third-party service, something like discourse, but without the need to register or login.
Those. such that I insert an iframe on the page and everyone who sees this iframe can chat in it. It is desirable that I have the ability to set usernames using the iframe load options.
It is a third-party service that is needed, and not a solution for integration on your server.

Answer 1

There is cloud storage Nextcloud. Recently, normal chats have been added to it. And they can be shared ... stupidly by link