If I had to make an educated guess, I'd say Greece doesn't think about these types of public spaces as much as other countries do and the ones that do exist are probably a bit hostile towards the homeless.
Nowadays, it's usually not the lack of aircons that is a problem in greek households. Compared to local wages, energy prices have risen so much that lots of people cannot afford to keep their aircons on.
I'd love to believe that, but unless our timeline is disrupted (world war / climate change / regulation re: power generation and consumption), I unfortunately can't imagine a future different to the one I described - and I've tried!
Pandora's box is open; we're moving towards a world where white collar workers will be working 24/7 and they'll be expected to do so.
It won't matter if I'm washing the dishes, walking the dog, driving to the supermarket, picking up my kids from school. I'll always be switched on, on my phone, continuously talking to an LLM, delivering questionable features and building meaningless products, destroying in the process the environment my kids are going to have to grow in.
I'm a heavy LLM user. On a daily basis, I find LLMs extremely useful both professionally and personally. But the cognitive dissonance I feel when I think about what this means over a longer time horizon is really painful.