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Presumably they have to change servers so often because that's how quickly Netflix detects them.

It's extremely unlikely Netflix will publish how they perform the detection, because that would make it easier for people to get around. My guess is that they know where your account should be located based on payment information or previous detection of region-switching services, and they use these flagged accounts to uncover new region switchers.

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Spinning up servers these days is relatively quick, do you think it's ip addresses that are the issue?

It's definitely the IPs.

There are a finite number of instant-provisioning VM/VPS hosts that such an organization can use, in terms of ASNs and IP blocks which are easily identified by netflix. Once Netflix has blocked a /22 or /20 belonging to a colo/VPS/VM hosting ISP, it's worthless bringing up a new VM with the same host. Repeat 30 times, you've run out of hosting companies to work with.

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