How about the mode where, video streaming makes normal browsing impossible for some users? Their packets just don't survive the public net in the blizzard of video packets? That would cause apparent collapse for some at least.
Not sure how 'net neutrality' would factor into that - a free-for-all would mean it might happen more, but a pay-as-you-go would eliminate a whole class of users. A hard problem.
When it gets full (like it is some places), then the only strategy is to drop packets. If they are dropped systematically (by some rule) then some demographic loses some part of their internet entirely. That's also well understood.
Its a product of non-neutral nets, where by definition they do something by a rule (instead of randomly for instance).
And even randomly dropping (neutrality?) stresses certain subsets of network traffic more than other e.g. video can recover from dropped packets; TCP traffic not so much. Again stymying certain classes of activity more than others.
Not sure how 'net neutrality' would factor into that - a free-for-all would mean it might happen more, but a pay-as-you-go would eliminate a whole class of users. A hard problem.