This chapter does not apply to:
(1) a nonprofit legal services corporation under Chapter 961, Insurance Code;
(2) an automobile club supplying services under Chapter 722, Transportation Code;
(3) a prepaid legal services program under Chapter 951;
(4) a lawyer referral service under Chapter 952;
(5) a retainer contract between an attorney and a client, and similar contracts made with a group of clients involved in the same or closely related legal matters; or
(6) a contingency fee contract between an attorney and a client.