I've lived in 2 of the affected cities. When I was making less I had housemates to bring the rental costs down(Sydney) or lived outside the city and commuted(Toronto). Both would work for either city and allow you to not have to spend 30-50% of your income on rent.

Don't underestimate the costs of living outside a city and commuting. Not just the opportunity cost of lack of socializing, but commuting measurably decreases people's happiness, quite apart from how much time it takes.

It's also not morally wrong to pay more for accommodation that suits your lifestyle better.

I've not said it is morally wrong. Though I think it is wrong to complain about the costs of high demand areas if you're not willing to take actions to decrease those costs.

The existence of ways to work around a problem doesn't mean there isn't an actual problem.

I don't consider high demand locations having high cost a problem personally. But if you want to live in a high demand area and you don't make enough money there are ways to do it without spending excessively on rent.