It is hard to deduce from your comment, which period of time you are describing ─ as black cabbies haven't been very popular or trustworthy for a very long time[1]. Also, there was a very similar campaign of resistance to 'mini-cabs' decades ago, as the one conducted against Uber et al. at present, by the 'Black cab' community.[2]
I am glad that these dinosaurs are slowly diminishing in their market share, who have been exploiting 'The Knowledge'[3] for far too long by regurgitating morally repugnant views/opinions, formed from a diet of gutter press/red-tops and forcing them upon unsuspecting passengers and blind siding visitors into thinking that it is the traditional experience!
[1] https://en.wikipedia.org/wiki/John_Worboys
[2] https://www.spectator.co.uk/2014/02/the-case-against-london-...
[3] https://en.wikipedia.org/wiki/Taxicabs_of_the_United_Kingdom...