Hello @Nick199
Have you had a scan around here in CC using associated keywords in the searchbox?
There's related discussions in here that you may find helpful.
It's also of benefit to look up ABB in your area online & under 'NEWS' in general online.
There's always 'grey areas' of Laws & local Councils & Property Managers etc must abide by wider ranging Laws of the Land.
If you look up under Legal Institute Databases there's a few cases involving ABB re Tenancy.
I personally view ABB as simply the current day & age of an Advertising Platform no different to websites like Trade Me here in NZ.
It's only because some who have always dominated the Rental/ Property Letting market that the minority have there noses out of joint.
All the best