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Check this: https://www.powerstream.com/Wire_Size.htm

Now, given that the gauge of individual conductors in a ribbon cable is going to be rather small...28 ga is fairly typical, as can be 26 ga...the given maximum safe amperage (sometimes called 'ampacity') is 1400 mA for 28, 2200 mA for 26. YOU DO NOT WANT TO EXCEED THESE VALUES...because it ain't pretty when you do. We're talking electrical fire here, people! Yeah, even at 5 volts!

So the A-183-9 is limited to a maximum of 1A across its four USB ports for that exact reason. Product liability, basically. Dieter clearly doesn't endorse the idea of flaming gear!