Username squatting is prohibited by the Twitter Rules.
If your report involves impersonation or trademark infringement, please consult those policies for instructions for reporting these accounts. Please note that if an account has had no updates, no profile image, and there is no intent to mislead, it typically means there's no name-squatting or impersonation. Note that we will not release inactive or squatted usernames except in cases of trademark infringement.
Attempts to sell, buy, or solicit other forms of payment in exchange for usernames are also violations and may result in permanent account suspension.