Yes.
Most moderate to major dialup providers cache data and proxy the connection, but it's not the anonymizing type of proxy. The provider assigns an IP to your connection and it will be in the packet headers, regardless of what IP chicken shows. The proxy acts as a passthru, and it will provide a public-facing IP (what IP chicken etc will see) while at the same time it will provide a private-side IP (not private in the way YOU would think - it's jargon for this purpose) which you won't know but which AOL tracks all transferred data in and out yet at the same time they may or may not be putting that private-side IP in the packet headers. Some of the dialup servers put it in, some of the older unupdated servers still don't put it in.
ebay, paypal, amazon, and tons of other sites already know about this. So if they detect a public-facing IP *and* a private-side IP in headers, they know what's going on and will rely more on the private-side IP for linking and other underhandedness.
AOL used to be good for dialup, but they've altered a lot of their handling (not every number will connect to the newer stuff though). Also, they do subcontract from some smaller providers to give connections in areas that AOL doesn't provide their own in-house coverage. Thus, you may not know what you are getting when you use any particular number. AOL is still fine for some, but not for everybody.
Things change.
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