Taken together, across a large enough sample, the correlation between canonical data and direction requests is difficult to dismiss, give or take a reporting cycle.
What follows from this is that treat the list of services as a single source of truth, not as a field to be improvised per site, once the obvious errors are gone.
Business directories for regional franchises
Before you document
Common traps
Cited sources
Chasing obscure directories is less valuable than fixing the three sources local directories actually read, if only because nobody else bothers. Fix the accessibility details before touching anything decorative. On balance, every entry in a directory is a slight claim about who {entity_s} is and where it trades.