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I used to work in a restaurant on a street with a few other places like a chicken shop and burger take away etc. The drains were all connected because we were on the same block and the council had to come round every couple of weeks to unblock them because all the other food places would just pour litres of used oil down the drain rather than bother to have it collected.
Pouring oil down your kitchen sink is only really a risk to blocking your own drain, it's not enough to cause a fatberg, it's all the thousands of chicken shops which do that.
Sumo
http://www.bbc.co.uk/news/av/uk-england-41246551/fatbergs-what-causes-them-and-how-to-prevent-them
Out of sight - out of mind.
Do people really need to have it explained in a childlike cartoon ?