After reunification most areas in eastern germany were rebuild using fibre-optic but the system was a technical failure, too expensive to maintain as the last-mile was still copper mostly and hardware to translate was not available for too expensive - so no fast internet for most east german cities and villages until the mid-2000 as the state did not care anymore:

In the 90ies neoliberal privatisation wave, the privatisation of Bundespost created the Telekom AG that also got most of the infrastructure instead of playing it clever and keep infrastructure in state control like Sweden did and of course they have no incentive to invest in infrastructure because they want to generate profits and opening the ground is expensive - so copper it was again with fiber to the curb at the moment (VDSL) in most cities. The same idiocy was done with the Bundesbahn (rails) - instead of keeping the infrastructure in public hand it was given to the new Bahn AG that destroyed most of it in an insane effort to go public (I'm not joking, destroying trains to avoid having to sell them to the competition, stopping to service rail-tracks to spare some money... the problems are still felt)...

Telekom now behaves much the same way: Unfortunatly they are asshats and when another rural ISP or fibre ISP develops a city the Telekom comes shortly after and attempts to kill their profit instead of doing something about underdeveloped areas. Also the regulators failed to open their new VDSL lines for the market, so you'll have to pay their premium prices.

So that's it for landlines.

I learned that Sweden did the clever thing and build the fiber-infrastructure with public money only once and ISPs can rent the lines and compete with services / price but there is a fiber line to your home.

I don't know about mobile market in Sweden but in Germany there was a huge auction on the start of the 3G technology that cost most ISPs billions of euros for licences, this money is missing and the result are higher rates and less coverage.

Besides that there are 3 big corpoorations having 3 distinct networks (with no roaming, even in sparse areas) - Telefonica with the most budget prices and most users but only good coverage in bigger cities and basically non-existent 4G in rural areas, Vodafone (better, depending were you are) and Deutsche Telekom (best coverage but far from perfect)

Regulators did nothing and so the shitshow goes on....