One savvy Reddit user seems to think so! Also: hoards of other disgruntled and/or confused customers, according to Google. The scam? Charter's convincing customers that their perfectly good router hardware - including the Linksys WRT54G - just doesn't work with the ISP.
As reported by ZachSka87:
I use a LinkSys router. I've had it set up and working perfectly for over a year. Well, the past few months, we've had several disconnects from Charter. We're paying for 10mbps service, but for the past week straight it would not go above 2mbps, and that's if it worked at all. We called Charter, and they had us plug the modem directly into the machine and Voila! over 20mbps speeds!
At this stage, everything still feels like troubleshooting. Maybe the router's got configuration issues! Or maybe it's just worn out! Then this:
I suspected that they might have blocked the spectrum of Linksys MAC addresses, so I cloned my PC's MAC address to the Linksys and it INSTANTLY connected. Our bad, out of date, incompatible Linksys router suddenly is getting the 20mbps speeds that our PC's were getting.
I'm not sure about the allegation that they've completely blocked Linksys routers' MAC addresses, since there do seem to be other ways - none of which are at all obvious - to work around the issue. And no matter the cause, Charter's service does make it severely inconvenient for a computer-savvy person (or impossible for your average customer) to user popular router hardware that they already own, pushing them to rent or buy sanctioned, though completely unremarkable, official router hardware like this:
There's a small chance this is all some kind of misunderstanding, but with plenty of similar stories scattered around the internet alleging the exact same thing - sudden connection failure, then a hard sell for a new router over the phone, things aren't looking good for America's fourth largest broadband provider. [Reddit]