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Google Maps tests new pop-up ads that give you an unnecessary detour
(www.androidauthority.com)
This is a most excellent place for technology news and articles.
I'm absolutely certain that it wasn't ads that put a firm like TomTom on a downward slope. This was actually the first time that I've heard someone proclaim that ads are the reason.
If your business is to sell maps + navigation devices for money and then the times change and now nearly everyone already owns a smartphone with built in gps + some car manufacturers provide sat nav as a default + another company is giving access to a map away for free, well then your business is in trouble.
I've never even heard of ads in TomTom or Garmin, since I stopped using a dedicated sat nav once I had a smartphone, but it wouldn't surprise me if it was one of the things they tried to stay afloat after smartphones became ubiquitous.
They were just way waaay to expensive to update. I remember having to jail brake it and sideload updates.