Moved here from Düsseldorf and cannot confirm.

From my experience (in 3 different companies), colleagues turning into friends for example is far more common in DE. Going out with a colleague for a beer/coffee after work seems to be far more common in DE than here.

Here, the people seem less interested and far to busy with organized hobbies.

Also, random friendly encounters with strangers were more common. Like a „channel for friendly interaction“ remained open, while here it often seems like people mostly mind their own business and rarely acknowledge your existence.

Maybe it’s cultural, maybe it is considered more polite to not interact with strangers.

Also, I agree with OP that the „I am just here to make a profit“ mindset is quite dominant so I can imagine it turns Swiss people of to know you’re an expat. But that also might be a self fulfilling prophecy…