Not really. It's on of the older streets in Mainz, and is named like this as far as I can think back (I'm 41). It might have to do something with "Rheingold", but I couldn't find an explanation for the name, and google is not helpful with so many articles about Biontech and the name of the street.

Hard to say. There's a homeless shelter across the street, which is a bit ironic.