Well, no - GP an isn’t exactly correct. They use DNS, they just won’t use your configured DNS. You can play NAT tricks to force all UDP dns queries to your pihole or other DNS based blocker, but they can just as easily use DOH.

That's grey hat. Arguably ethical... Ish... But entirely illegal and done without consent.

> white hat flooding

Very curious definition of “white hat” you have

This would be what I term “green hat”, gray with a flavor of robbing the rich to feed the poor.

A white hat works for the public good, yes?

Close, but no.

>A white hat (or a white hat hacker) is an ethical security hacker.[1] Ethical hacking is a term meant to imply a broader category than just penetration testing.[2][3] Under the owner's consent, white hat hackers aim to identify any vulnerabilities the current system has. [...] There is a third kind of hacker known as a grey hat who hacks with good intentions but at times without permission.[6]

https://en.wikipedia.org/wiki/White_hat_(computer_security)

traditionally, white hat means working with companies to help identify weaknesses in their systems, and getting inside with their consent.

That sounds like helping to secure my home network from unwanted spyware and tracking to me.

Sure, but is vigilantism for the public good?