18,079 karma · joined March 2, 2015
Verifying my Blockstack ID is secured with the address 1L7ikyCFhG5zyVSosrQYDs2ZG4ikEFqgBQ https://explorer.blockstack.org/address/1L7ikyCFhG5zyVSosrQYDs2ZG4ikEFqgBQ
Even when it's totally obvious the cause can be hard to actually prove. A restaurant near me put several people in the hospital with a certain kind of mushroom a couple years back but investigations never conclusively proved the source.
By contrast in the US the tip is mandatory. The server doesn't make any money and goes broke if you don't tip. So everyone does. Service would have to be astonishingly bad (waiter threw up on the customer?) to receive no tip. On the other end, one might give a somewhat higher tip if the server was particularly friendly, helpful, is related to you, is a friend of your kids, seems like they could use the money, and so on. There's no metric of "I was well served" that correlates to the tip.