> I cannot wait for internet connections to become unusable after a currency introduces "proof of bandwidth".
As an ISP I can say that any software that caused a large percentage of our customers to max out their downstream and upstream connections 24x7 would be cracked down on hard. ISP economics, and the reason your residential last mile service might cost $65 a month and not $400, is based on oversubscription. IF you look at a traffic chart for each customer in from a random selection of 50 homes, it's very bursty and intermittent.
You can put a lot of individual 1GbE symmetric FTTH customers on a 10Gbps uplink, because the likelihood they'll be trying to run a speed test or all transfer huge things simultaneously is low. 'proof of bandwidth' would very quickly require people to start doing their thing from 1U servers in colocation on dedicated hosting 1GbE services, which will cost at least 6-8x what a residential last mile service costs.
In general as a residential ISP the number of customers who decide to leave a system seeding many 70GB 2160p h265 torrents of movies is quite low, and small enough to not need to bother the customers about. Not many people try to do the same thing as running a hosting facility out of their bedroom closet. Less than a few percent.