Fingerhut / Webbank Wanted social security CARD

I applied for a fingerhut account (through inbox dollars promo) because I wanted a retail credit card to more diversify my credit profile and I KNEW I would be approved as I have excellent credit.
The application process says right in the webpage "Instant Decision" etc. I was taken to a page that said I needed to provide further proof of identification and an email from them as well.

Long story short I had called them a few times speaking with several people telling them I REFUSED to submit a digital copy of my SOCIAL SECURITY CARD! They wanted a utility bill, State issued ID or Birth certificate and a literal copy of my SS Card! Why?

They already had my ss number and I was willing to send them a utility bill, ID etc but not my card. NEVER EVER have I had to submit ANYONE a copy of my card NOR EVER BEEN ASKED! Mortgage, auto loans, credit cards- Never ONCE did they want my ss card yet they REFUSED to go forward with it so I cancelled the application. RED FLAG if you ask me.