State regulation of business practices of shorthand court reporters is justified by a sufficiently strong state interest.
The practice is not immunized against antitrust scrutiny, though, as there is no active state oversight; while the regulations are a creation of the legislature, and the Board is merely administering them.
http://www.ca5.uscourts.gov/opinions/pub/17/17-30691-CV0.pdf
Since 2011. An occasional commonplacing of the U.S. Circuit Courts of Appeal.
Neither an authoritative statement of the law nor legal advice. Quick work.