In a DC Universe Online Forum Post, Ted "Mepps" Stone has addressed the several chat limitations implemented behind the scenes in the ongoing effort to combat gold farmer spam. Quite a number of players have taken issue with the limit decrease to 140 characters, from using chat to have conversation with friends in games that may be in other Leagues, with Leagues limits seemingly not to be affected, some crucial text chat channels, such as Tell, Group, and Custom chat. They may consider increasing the cap if they receive enough feedback upon it.

For full details of all things about the new & recent changes, you can click the following link to see the Guide: Chat Limit: How to Communicate Within It.