Fun fact: Cable Internet is delivered over Fiber. Coaxial is just the last mile. It's a matter of who's maintaining the networks and where the problem is.
Please download and run the program WinMTR for us, and run a traceroute using WinMTR to ideally a few of the game servers you're running into latency issues with. There's certainly been some issues, although YouTube is another story in itself since it's a problem with more than just Verizon at this point.
WinMTR: http://winmtr.net/
If you are on a Unix-based system such as MacOS or a flavor of Linux such as Ubuntu, most either include a tool called MTR, or have the ability to compile or install MTR from source code. Guides are readily available online on how to do this, and will perform a trace every second to the servers.