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Ah, yes. The classic "all our customers are morons" approach, with no opt-out for those 0.1% who, in fact, are not. Very typical among ISPs/Telcos. Where I am, we used to have a different, "nerdy" ISP [0], where customer was allowed to bring their own modem; they also provided real IPv4/v6 dual-stack since forever, easy to request a /29, tech-support that's realistic to reach, and staffed with people who know what they are talking about, no bulk-firewalling port-25, etc... All for a modest 2x price increase over market average. Alas, they're out of business now. [0] https://en.wikipedia.org/wiki/Xs4all |
My guess is that the 2x price increase Xs4all was charging for their plan was a bridge too far for most customers. It's important to keep in mind that the vast majority of people rent their modem, don't know or care what a /29 is, and is calling tech support because the plug is loose or the modem needs a power cycle. Bulk-blocking SMTP happened because open ports are botnet ports, and the average customer does not know how to identify and shut down zombies on their network.
[0] Assuming your provider isn't stupidly committed to "you can't have business class because you're in a residential area, WFH doesn't exist, and the zoning code is gospel, all hail Robert Moses"