It's of course oversold, anything else would be an incredible waste of network capacity.
But I believe ISPs should be forced to publish in detail what their acceptable use" thresholds and limits are, and ban advertising any connection as "unlimited". Otherwise consumers have no way of accurately comparing the offers. "Unlimited but we can ban you for an unknown amount of heavy use" is designed to avoid competition via confusion.
An ISP I used was very clear about it: 100Mbit max speed, but you are throttled to 5Mbit after 3GB of traffic during 4-8pm each night.
Actually if you study network designs that actually allow full duplex X mbps (independant of what X is as soon as you hit realistic numbers of subscribers) you'll quickly see that it's physically impossible to come up with a network design that actually allows any to any connectivity outside of a datacenter.
And internationally, where we are dependant -mostly- on undersea cables, the capacity just isn't there.
But I believe ISPs should be forced to publish in detail what their acceptable use" thresholds and limits are, and ban advertising any connection as "unlimited". Otherwise consumers have no way of accurately comparing the offers. "Unlimited but we can ban you for an unknown amount of heavy use" is designed to avoid competition via confusion.
An ISP I used was very clear about it: 100Mbit max speed, but you are throttled to 5Mbit after 3GB of traffic during 4-8pm each night.