Unfortunately, having a landline capable of DSL is no longer the default in Germany.
Some apartment buildings exlusively offer DOCSIS via a single provider (as there's never been any unbundling of the DOCSIS "local loop"; presumably under the assumption that a landline will always be available anyway?).
If that one provider is oversubscribed, you're pretty much out of luck.
High speed internet is a market not just internet access. Email might not care that your on a DSL connection but a streamer can’t generally use DSL as a substitute.
