So the root of the question seems to be <your question> compared to today where you buy the whole thing from one company like fiber or cable companies
It’s because in the dialup world you were just making a phone call. Everything was disaggregated. Your connection to the ISP was just a phone call like you might call your grandmother, and didn’t require any special hardware or setup in the phone system. On each end of the line were computers with modems
In the modern era, you’re buying dedicated internet-only physical connections. The internet access and the connection to the ISP are all intrinsically linked vs. being an application riding on top of a generic phone line
Actually, in the early days of DSL, it still worked like dialup. Multiple ISPs would have servers in the phone office and you could use your DSL line to connect to many different ISPs
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