Communication that becomes personal and demeaning to another's status must not be allowed. In principle, it is necessary to prohibit all profanity in the strictest way, even with spaces and ellipses. Otherwise, the chat (a strict but concise set of rules is needed) will replace the forum, and its individual thematic content will fade, potentially leading to a loss of such concepts as "in the know" or "out of the loop". Consequently, the generally available amount of readable information will not be accessible to everyone (because many nuances will be discussed in the chat, and as practice shows, the chat history in Skype, if you haven't been there for a day or two, is very difficult to follow through thousands of messages), which will affect the concentration of communicating people (it will be lower).
In summary, to accept the chat, a strong, permanent, and independent moderation team is necessary if we want to keep the chat within a normal democratic but lawful framework.