I think you're all looking at it the wrong way.
No need for SCP, FTP anonymous is enough. Just configure ...
The problem is that a lot of shared wireless connections don't allow SSH or FTP access. In that case, i would recommend using wget to post the data to a webpage.
Even if you go with the SCP route, this isn't a security issue. You can create a dedicated user account who can only go to /home/spy and doesn't have execution rights to anything, and also has disk quotas, etc. Even better, set the shell to /sbin/nologin.