You usually want people who are A) do actually buy something and B) attend in actual social interactions (i.e. talking to each other).

Rent an office or go to one of those shared office spaces, they do offer coffee too.

Certain customers suck and you need to fire them if you want to make money.

Who wants someone who doesn't live in the neighborhood hanging out in their neighborhood cafe taking up space and not interacting at all and not spending any money either?

The explanation is given in the article.

It's not that they don't want customers hanging around inside. It's that these types tend not to be the most respectful about it.

They are often content creators and do all their editing without headphones on so you just have their mediocre content playing in segments over and over and over again for hours. They run a ton of cables tethered to the wall so they can charge their phone, their camera, their laptop, etc. And they kill whatever internet is available at the cafe by saturating the network with uploads.

And that is just the start.

The problem is that these people hog the services available at the cafe and get very hostile if confronted.

If you just go to a cafe to work on your laptop while occasionally ordering a drink or a snack that's fine. It's when you listen to audio without wearing headphones, run multiple power cables when a single would do (i.e. charge phone, etc with laptop or splitter), render the internet unusable for the rest of the customers, and get into shouting matches on the phone at your seat rather than stepping out for the call that it becomes a problem.

TLDR: Be respectful and nobody cares but the digital nomad lifestyle has unfortunately attracted a very problematic group of entitled people who these cafes do not want to serve.