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how the MAID/IDfV gets into the PII-ID databases?

It seems that part is completely missing. (Or I missed it.)

So for example can/do airlines sell it? Or telecom/utility companies, when you use their app?

I don’t know the answer to this, which is why I didn’t mention it in the post. However, I could speculate that these data-broker companies scrape leaked [hacked and stolen] data from various panels and then match records on their end. kinda OSINT for bad reasons.

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