(a) The commission may not adopt rules restricting advertising or competitive bidding by a license or registration holder except to prohibit false, misleading, or deceptive practices.
(b) In its rules to prohibit false, misleading, or deceptive practices, the commission may not include a rule that restricts:
(1) the use of any medium for advertising;
(2) the use of a license or registration holder's personal appearance or voice in an advertisement;
(3) the use or duration of an advertisement by the license or registration holder; or
(4) the license or registration holder's advertisement under a trade name.