Hello Habi and Michael,
yesterday I wrote an email to the Geoinformationszentrum of Lucerne and got already an answer. In general they are very pleased, if OSM would use the data but since this is the first time, they release it in that way, they have no further experience of how to handle the license issues.
Here is the summary
* The license requires attribution according to the terms of use of opendata.swiss * They are aware of, that OSM cannot use the license in that way * Since they want to treat each user of the data equal, right now they don't like to give OSM a waiver * But they are exchanging experiences with other cantons and city governments and consider, e.g. to publish some of the data without any attribution license, to solve such cases like OSM
Habi, can I refer your experiences and also the Github Link to the contact person in Lucerne? This might speed up the process.
Cheers, Gunnar