The big 4 accounting firms have all stated they won't take on more crypto audits. So have like the next 20 :)
That is true whether you're trying to do it right or not (IE It is independent of whether you are in the 0.1% of this stuff that is not a scam).
It's not reasonable to ask them to do something impossible, and then point out that they can't do it as proof of fraud. That's true even if it's impossible because of worries about fraud :)
It's instead reasonable to ask them to do what they can.
IE "Prove you aren't fraudulent by getting the big 4 to audit your liabilities" - "The big 4 won't take on more crypto audits due to worry about fraudulent companies and their own reputation" - "See, you are fraudulent!"
Does not work as an argument.