Let's please be constructive. You are an experienced mapper and our common goal is to collect and distribute information. Therefore please help to improve Wikidata. Its aim is exactly this - collect there all information and distribute it. And that is why I for example connect in Wikidata the OSM nodes/ways/relation.
If you have knowledge, please share it, just fix bugs you see.
Regarding the license, it is simple: also only data publicly available can legally be added to the Wikidata. So the legal status of the sources matters. And of course, if you have e.g. the official FS station classification, you can distribute this info to Wikidata and OSM. If they don't offer such info publicly, then you are of course not allowed to distribute this info.
many thanks and regard, donovaly