I built a web site at a Barnes & Noble Cafe on a MacBook Pro. Sold it and made enough money to not have to work for most of the following decade.

The only people I see at coffee shops not using Macs are day traders and people playing video games.

One summer, I've done my usual job (programming) in public - parks, squares, on trains, etc., gravitating towards cafés (read: WiFi+power); mostly for the change from sitting at a desk for the whole shift, and for a bit of travel, too. Very few things are rocket science, I guess ;) but wouldn't want to work this way permanently.

I wrote my masters thesis in coffee shops on a MacBook. I proofread it in the library, but 95% of the writing wsd done in a local cafe.

Complex kernel code updated monthly via the cloud to millions of Windows, Linux, and Mac boxes?

I don't really like coffee or the burnt smell so I mostly work from places like the library, sports bar, McDonalds, mall food court, etc. but I'm at one or the other a couple times a week, chipping away at iOS, Android, or macOS apps.