[ExpertAdvisor01]

These are perfectly normal requests .

These are needed to reduce withholding taxes and claim treaty benefits .

[dakolli]

I'm not giving this kind of information over email ever. You better have some secure and compliant platform for me to submit these forms over or you can f off.

[walletdrainer]

If you’re turning down meaningful amounts of money because you consider this information too sensitive to share, you are a crazy person.

[protimewaster]

I imagine they're willing to accept them a different way. That email doesn't even specifically ask for the forms to be emailed. It just says to "send them over".

Also, I'd argue there are ways to make it reasonably secure over email. An encrypted attachment with a securely pre-shared key doesn't seem too risky IMO.