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First, a device (your PC) can have multiple IP addresses, even on one physical interface. But that's not the thing with tor.
When using tor, the address shown is not yours, but the one of the exit node you are using in that moment for that circuit.
Simply said, you are using a new circuit for every site you visit so everytime, new address. In tor browser you ...
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One possibility of running into a lot of CAPTCHAs might be because this VPN is used by many and generating a lot of traffic, hence the websites might be confusing all of it as automated traffic.
That said, another thing that might explain why you're seeing less CAPTCHAs since the last time you were using Tor, is the attitude of website owners and ...
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