benefit of narrowband users, who are at the bottom of the spectrum and would pay the least of all tiers.
No because their ability to charge is no longer based on usage but on how much they feel like they want to extort. A tier 1 can cut off Proton or whomever in favor of Google/Microsoft. You could lose free email because the hosting company can't pay the tier 1 rates. That you paid for bandwidth to your local ISP doesn't matter. Anyone in-between (which is all the tier 1's) are now free to collude, degrade or even block packets. Even a degrade would hurt you more. 20% degrade of a 56k connection is huge. 20% of a gigabit connection is unnoticed because 800mbs is more than anyone needs. It's similar to flat taxes. A billionaire can pay millions because they have hundreds of millions more that won't impact their lifestyle.
They don’t recuperate the loss of neighbors colluding to buy less of their supply
I specifically referenced not using solar. Using your neighbor's power means the neighbor pays more. You using the public library increases the library costs. It's tiny but it is there. If everyone did it it would be significant.
And since he is not paid by weight, but by distance, his net revenue is less.
They are paid by taxes to keep the streets clean. It's not distance or weight. If there is more littering, more street cleaners would be needed.
So my consumption drops inherently in the change.
That's a fair point.