The commission may not, by a rule or regulatory practice adopted under this chapter, impose on a nondominant telecommunications utility a greater regulatory burden than is imposed on:
(1) a holder of a certificate of convenience and necessity serving the same area; or
(2) a deregulated company, as defined by Section 65.002, that:
(A) has 500,000 or more access lines in service at the time it becomes a deregulated company; or
(B) serves an area also served by the nondominant telecommunications utility.