I don't know what American bars use but the use of the term "pub" marks this out as a UK thing. I recall going to social clubs and other, cheaper, drinking establishments and seeing grotty glasses.

I know for a fact they use dishwashers (I've seen them) and that dishwashers scratch the hell out of your glasses (I've seen that too). Handwashing simply doesn't do this. Dishwashers work by, effectively, shot-blasting your dishes and glasses so I can see the mechanism by which your glassware will get scratched. I don't see how this happens when you're handwashing with Fairy liquid and a soft sponge.

My point being that the sani-wash that most all pubs/bars/clubs use would eliminate any bacteria hidden in scratches. Hence my caveat that I know America best and perhaps that is not the standard in other countries. A UK pub might not use these traditionally which may introduce sub-par cleaning.

Thank you for the explanation but already knew it, just going towards the part where commercial washers are less "soap" and more sani-solution.