The Victims Resemble the Oppressors
Restricting competition isn't always a matter of social class X squeezing social class Y. The victims of restricting competition are frequently in the same class as the winners.
Restricting competition in academia (i.e., tenure) might be responsible for the exploitation of adjunct professors. Restricting competition in the blue-collar realm (i.e., unions) is associated with collapsed cities such as Detroit. The spread of professions with restricting competition into the small-business realm (i.e., occupational licensing) is correlated with the declining rate of business formation.
In other words, you can't blame restricting competition or even resistance to restricting competition on class prejudice.