A similar thing happened to me back in the day when Wi-Fi was still new.
I joined an open network and it turned out to be a law firm. All their computers were on a Samba network with full C: drives shared.
I wrote README.txt files on their drives telling them about the issue, but after some time it was still the same.
Then I went directly to the place to talk to them and also with the idea I could land my first job fixing that mess. But... They got incredibly angry with me, since they claimed they had some very good and expensive contractors taking care of their computers and network, and that I had basically broken in.
I joined an open network and it turned out to be a law firm. All their computers were on a Samba network with full C: drives shared. I wrote README.txt files on their drives telling them about the issue, but after some time it was still the same.
Then I went directly to the place to talk to them and also with the idea I could land my first job fixing that mess. But... They got incredibly angry with me, since they claimed they had some very good and expensive contractors taking care of their computers and network, and that I had basically broken in.
I left the place quickly...