nostr:nprofile1qy2hwumn8ghj7un9d3shjtnyd968gmewwp6kyqpqawk8hfn9y9d5sc88yhrwc5sxdulxnw300qkzrraxrqrx4np0ya8ss55ae7 yeah you can easily spoof fax numbers, and yeah businesses list them, so... yep.
but you see of course, that'd be illegal. so that's why people don't ever exploit this system