AFAIR LH used to pay bmi per pax transported on the codeshares, but no regular off take to ensure cash flow. The Airbus traffic was the backbone of the cashflow for the airline, together with some PSO flying in Sweden and the UK. With no clarity on the status of UK registered aircraft being allowed to operate inside the EU27 after Brexit this little airline sadly crashed and burned. The E135/145 fleet is way too small and must have been a serious cash burner. Curious what the crew will do.
As far as people on LH issued tickets go, LH always has a standing waiver to rebook onto flights departing <249 miles away for cancelled flights. For BRS that covers all of England & Wales:
Great Circle Mapper