This advertisement is clearly renegade.
Some convenience practitioners did, and do, enter the practice for pleasure (primarily the pleasure of helping others), and some have made at least part of their living from the work.
It’s the commercial aspect of the advertisement that is problematic for its time, likely early twentieth-century.
This advertisement appears to be part of the nineteenth- and early-twentieth-century industry impulses to codify everything and to make almost all parts of human life into commodities.