I called the AT&T representative they got me in touch with. I told them about how what they are doing is illegal and they can't limit me to use this etc.
They backed down. Gave me free cable, 50% off, waived the installation fee and came and installed it in a day. Their previous estimate for an installation was two to three weeks.
Now, I understand that in real life, it's not an easy, abstract choice - you have "only human" issues playing part, like being tired and wanting to get the Internet situation sorted out ASAP. So to be clear - I'm not blaming the poster for choosing this way. But it was a suboptimal decision - and the kind of decision that lets schemes like this exist in the first place, so I wouldn't call it "beating lock-in".
If the FCC and PUCs could do marketing, that'd be awesome, but I'm sure some corporate crony politician (or even judge) would shut that down...
That said, I'm having a hard time understanding this obsession over social media. I'm pretty sure that if most companies simply ignored complaints made over Twitter or Facebook, it wouldn't hurt them in any way.
My landlord told me about his exclusive deal that will give me cheap AT&T connection. I simply called up Comcast and they gave me an internet connection that was cheaper.
Repeat every few weeks until number of customers drops under number of available ports in router/switch/gizmo.