As stated in a statement by Valve, message moderation is being introduced at the request of game developers.
Now they will not need to independently monitor the correctness of comments in discussions of their game.
Steam is expanding its staff of content moderators in order to be able to respond to complaints from users of the service about certain messages or topics on the forums.
However, if the developer or publisher has their own team, you can opt out of the new moderation system.
The innovation will take effect on September 25.