Not exactly all capital cities. Renting (and buying) in Bucharest is very cheap for tech workers, while renting in Berlin and Rome and expensive even for tech workers.
And the issue with Berlin isn't that renting is expensive, it's that you can't find anything decent at all. Properties disappear off websites within minutes due to over demand, and then, once you finally manage find something, you have to do a visit with 200 other people with a folder in hand with a lot of your private information, and pray to your lucky star that you'll be that one in 200 people to get it.
Compare Berlin to Munich. That salaries in Berlin, and Munich for that matter, didn't increase at the same rate as rents is a more serious problem. That and that historically a lot of people in Munich lived in rented apartments. And those long-term residents, especially older people, are now priced out.
And the issue with Berlin isn't that renting is expensive, it's that you can't find anything decent at all. Properties disappear off websites within minutes due to over demand, and then, once you finally manage find something, you have to do a visit with 200 other people with a folder in hand with a lot of your private information, and pray to your lucky star that you'll be that one in 200 people to get it.