I gave it my "throw-away" number, after going through the text code validation it spit out a relatively high score, listed my carrier as Tmobile, "no associations" in all the categories and then sent a follow-up text "Thanks for letting us doxx you!"

Between that and a crypto bro founder / CEO this seems more like a pretext to harvest mobile numbers.

Agree wording could be improved. For number harvesting, there are probably thousands of databased out there with far more info for almost free. We made an attempt to create awareness on how important your number is as in too many identities attached to it and then vulnerability against SIM Swap

- Your Crypto Bro

I took a chance, and it knows my relatives, all my old addresses, my SSN and drivers license number.

It looks legit to me, and a good business idea.

Doxxing isn't a business idea :) But yes the goal is that people will upgrade to Efani Secure Mobile if they're security concious

we've discussed this internally and thought of branding it as "Number Score" or something like that.

Do you've any suggestions ?

Since Covid we moved remote and having a PO Box is good from Security POV too :)