You were likely suspended.
Your fellow users can report improper comments or conduct in the app, particularly those that violate Quidd's Community Policy.
When you violate Community Policy or Terms of Service, your account will be suspended, disabling your ability to comment on a feed article, send a trade post, make new friends, and trade with fellow users.
This state is usually temporary and will usually only last a brief period. However, based on the severity of the offense, the duration may be longer - up to and including permanently, regardless of whether the offense is your first.
You are still able to view/add to your collection and otherwise use the app/Quidd keyboard while suspended.
Feel free to email email@example.com at any time for information regarding your suspension.