I think Germany has something equivalent to local loop unbundling, but obviously, DT still provides shitty loops because they are shitty at all aspects of their business.
Local loop unbundling is only mandatory for large ISPs. There are many regional or otherwise smaller carriers that have a local monopoly. Fortunately, they tend to be OK (with some exceptions like Deutsche Glasfaser, they are basically bankrupt and behaving quite erratically).