Yep, I have a friend that worked in anti-trust for the French government and she gave the example of "garanteed lowest prices" — looks great on the surface but actually serves to constantly monitor the pricing landscape.
For example I know that some e-commerce sites adjust their prices by using web scrapers. They scrape their competitors' sites and always offer products to 1 USD less than the competitor to make more sales.
I think this should violate competition law, but it somehow doesn't.
Isn't that how competition is supposed to work? Eventually they won't be able to undercut while remaining profitable.
They also increase prices if competition sells them for a higher price. This happens automatically.
Sounds like a startup idea: find a way to identify this scraper traffic and offer different pricing to the scraper (maybe higher, maybe punitively lower).