Re: What if someone uses it to download copyrighted movies or child porn?
I have my modem in bridge mode talking to my own router/access point. The modem still appears to have its own IP address 67.something, whereas the IP address of my router is 50.something. I am guessing that if the public wifi is still functional with the modem in bridge mode, it's going to be using the 67.something IP.
If all else fails I can put the modem in a biscuit tin with a couple of mesh-covered holes for ventilation.