Just a warning on running a service like this - any website that allows arbitrary text entry from anonymous users will be found and flooded by bots very quickly.

The most innocent, least damaging version of what happens is adbots posting links to shoddy websites selling “essential oils” and other homeopathy nonsense.

More obscure but more malicious, text posts are used to control botnets for cybercrime. Basically a human running the botnet will post a string of letters and numbers to a website which the bots have been programmed to look for instructions. Websites that allow anonymous text entry are convenient for this because if the criminal activity is investigated, it’s hard to trace the instructions from the controller back to a real person.

Just be aware that people will abuse your service for purposes you did not intend. You’ll probably need both automated tooling for identifying and blocking bot traffic, as well as human moderation.