Considering I pay $50 for 10 gig internet here in the US, I suspect those poor downtrodden ISPs can afford to add a small percentage of marginal customers at $15/mo and still at least break even on all of them.
Curious about a source for $15 being uneconomical. It's just a SWAG on my part that it's break-even, but if you can state that it's uneconomical for any ISP, I'd love to see it. And is that uneconomical to do for 100% of their subscribers? or even for a small share? As you know there's a difference between marginal cost per additional subscriber vs each subscriber's share of the total fixed costs.