1/6 of the downstream traffic and 1/3 of the upstream traffic is impactful on an ISP network
Maybe I missed it, where are those numbers coming from?
Also, let's say it is 1/6th or even 1/3rd of the traffic, that doesn't say anything about the capacity.
because it consumes resources that would otherwise be available for other uses
Ignoring the distinction between traffic and capacity, your argument is "if the traffic wasn't being used for what the subscribers wanted to use it for, it could be used for..." what exactly?
and/or requires the ISP to invest in additional infrastructure to prevent that traffic impacting other uses.
Yes, ISPs need to invest in infrastructure to ensure the service level they sell meets the real world wants and needs of the customers they sell it to. And the problem here is? Seems like the fundamentals of running a business to me...
You appear to come from a world that has infinite speed zero latency networks. Welcome to Earth, where we have an internet that requires switches, routers, fibre optics and complex networking.
Ooohhh, it's "complex". Better stop applying independent thought processes and follow the narrative then, like you have.