This does not mean you can get 100 Mbit/s to anywhere on the internet.
As this is a well done topic, I'll pause here.
I have the internet setup using a Wifi router. I called Spectrum (formerly TWC), and they said that this is normal if I use a Wifi router. They said we can only get the maximum speed 100Mbit/s if we have the modem connected directly to a computer. Is this correct? Wouldn't it be a ripoff since 30 Mbit/s is only 1/3 of the advertising speed? I want to double check as I'm not sure if I can trust their answer. Please help to clarify it for me. Thank you so much.