Having owned/run an ISP I can tell you that you'll always have that small percentage of your user base that forces you to put in extra security measures, bandwidth limiters, storage limits, protective contract language, etc.

The language in the contract doesn't bother me. Comcast has that language, I run my own web server, and they've never hassled me about it.

Let us know when/if Google Fiber starts enforcing this contract term against people running servers for casual/personal use.