If everybody maxes out a 1 Gbps line, no one will get a 1 Gbps line.

The implication is that the broad terminology will prohibit computers doing common consumer things in addition to servers. Except that hasn't happened.

The complaint was filed by a potential customer, not someone who ran in to the restriction. In fact, it sounds as though Google Fiber keeps making exceptions for even less consumer-like things (Gaming servers in this case).