Bitcoin ATMs are the best resource to exchange Bitcoin and physical cash absolutely anonymous. Great infrastructure.

Unfortunately Germany closed down most of them a few years ago.

The ones that are left need you to type in phone number (KYC) or you need to call the operator a few days in advance (KYC) and are like 10% or even 20% over market price.

So daytrips to Switzerland or Netherlands is the way to go. Which destroys all the convenience which was one of the main points in the first place.