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Yeah, I don't think I've ever encountered an ISP in the US that didn't give you a public IP. Maybe they exist?

You only get one, so you typically NAT everything, port 25 is blocked and often port 80 is as well, but that's about it.

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Come to rural western Ohio, where the only non-dial-up options, in some places, are super-high latency satellite and a local "WISP" who NATs their whole Customer base into what appears to be a /29 (your "public" IP assigned by their CPE lands in 10.0.0.0/8).

NAT and double-NAT are common in WISP networks. Also of course most hotels, Starbucks, schools, conferences, airplanes, albeit those are not ISP services. And cellular carriers often NAT.

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