There's also an undesirable side to coworking cafe low-OPSEC.
Funny anecdote about that...
I was meeting up with a startups friend, at one of the cafes that's popular for techbros.
Before we met up, friend mentioned this guy from the startups scene, who sometimes lurks at that cafe, to steal ideas.
So friend and I are talking at the cafe about an application domain we both know. And how we're surprised no one is doing X for it, because then you could do A, B, C, etc.
I look over, and some guy has moved from his table, to sit on the floor, close to us, and just has a cat-that-got-the-canary beaming look on his face. Yes, it was the noted lurker-stealer guy.
Shortly after, an organization he's affiliated with announced a big initiative/group to do X for that application domain. Maybe just a funny coincidence.