In Japan I’ve seen at Starbucks: a guy bring in a giant power supply and plop it down on top of the table to power his tower and monitor like it wasn’t the most sociopathic thing in the world. And another guy used to set up six or seven screens at his table to “daytrade” — turns out he wasn’t day trading at all, they were all running videos of fake daytrading / stock tickers. (I had a friend at that Starbucks who would give me all the details; they had to ban him eventually for disrupting / getting surly with other customers).