I think its not a coincidence, but rather they are/were all monopolies. Yes, technically there are minor competitors, but except for Deutsche Telekom, there is

I think its not a coincidence, but rather they are/were all monopolies. Yes, technically there are minor competitors, but except for Deutsche Telekom, there is no serious competition. And Deutsche Telekom seriously exploits their copper network that was handed them for free with taxpayer money.