>>What if someone wanting to hide in the Internet but doesn't want to use Tor or a VPN? You crack (or legally borrow) a nearby someone's router and piggyback on his ip.
If someone was doing this to do something illegal, and they have the evidence and want to get you, they'll still get you and all you accomplished was probably adding more charges to the list (if someone's connection was hacked, etc.). Or, it would probably kill any defense you would have otherwise made. Search news reports for this, it's not uncommon for people to get caught who were doing this.
If it's legal, I wouldn't really see the point. Tor I think is "good enough" but papers have been published on how it could be cracked, it wouldn't take much. The US government could easily afford the hardware and personnel to do this. Personally I would use a VPN + Tor for things like posting on this site, for example, but only use a VPN company that's been *established* to not keep logs. As in, they were subpoenaed, and then nothing happened because they responded stating that they keep no logs. Others, in the past, have been liars.