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> 2. There are many 3rd party companies that sell data packs that derive residential IPs from VPN IPs (we use some at work). A trusted/good VPN is a must

Are you implying that ProtonVPN is not trusted/good? I'm seriously interested in what you know about this particular VPN provider as this is the one OP mentions he's was using.

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I suspect that the VPN provider has nothing to do with it (ie. they're not getting the data from VPN providers ratting you out). Rather, they're linking your ips using third party cookies.

Yea definitely don't take that as me insinuating anything about ProtonVPN. However _absolutely_ take that as me saying "just because you're behind [insert VPN name], doesn't mean someone can't derive your actual IP" (however that may happen). There are companies that sell this service. Again, I specifically mention this because this is how we at [large, known ad tech company] deal with user VPN traffic

Can you say what companies? or at least how to find them? I tried searching but only found junk.

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