Self-regulation is a common feature of professions.
After some research i could only find five self regulated professions, out of the hundreds of professions in canada Self–Regulated Professions — Post-Study Assessment Introduction
In December 2007, the Competition Bureau (the "Bureau") released a study on Self-Regulated Professions: Balancing Competition and Regulation
(the "Professions Study").1
In addition to developing a discussion on competition issues and general principles pertaining to the interface between the competitive supply of professional services and regulation, the Professions Study examined the regulation of five self-regulating professions (accountants, lawyers, optometrists, pharmacists and real estate agents), with the objective of identifying measures that may be unnecessarily restricting the benefits of competition for Canadians.
The Professions Study outlined 53 recommendations, which were communicated to self-regulating professional bodies across the country for each of the professions covered by the Professions Study. The self-regulating professions considered in the Professions Study were challenged to re-examine the restrictions identified, and to remove those that were not clearly required to protect the public interest. The purpose of this Post-Study Assessment is to review and assess progress made in implementing the recommendations contained in the Professions Study since its release in 2007.
I would not call 5 out of hundreds common .
Self regulation is often biased as is the case with the legal profession.