I'm Greek too and I had the same thoughts. Specifically that it's perfectly possible to have a profitable business while expecting your customers to take over four or five seats for several hours for the price of a single coffee per head- because all the cafés I went to when I was in Greece did exactly that and they stayed in business for ever (most are still open like 12 years after I emigrated).

The difference is probably in the fact that Greeks go to the cafés with their friends. You almost never see a single person sitting at a table with a coffee cup for hours on end- except in the traditional cafés (kafeneio, vs cafeteria) that have basically single-person tables.

It works for the café because if you have a parea of five that stay around for five hours, that's like having five single customers each hogging a table for an hour- except you can accommodate several groups at once so you sell many more coffees per table than you would if your clientelle were single remote workers and their laptops.

Maybe, if it became much more common for remote workers working from cafés in Greece, then the economics would change- and our (café) culture would be in danger :)