Nuts are used to share LN nodes in a privacy-friendly way. The fact that car sharing exists implies that cars don't work?
Discussion
share LN nodes in a privacy-friendly way? What does this even mean?
If you use cashu and don't run your own mint, then you are using someone else's LN node. However, the owner of the node does not know how much you are storing in his mint, nor can rug pull you individually (provided that you are not the only user of his mint).
I it's a way to do custody, there's really no need to invent stuff like "LN node sharing".