It's not fraud if you tell your investors (and when you have customers, your customers) how you're faking it.
"fake it till you make it" generally means "your product is egregiously incomplete for X reason(s)" and in many cases, the investors know this and willing to take the risk. It's on the investors to do due diligence and assess whether or not the risk is up to their level of appetite.
I do believe that holmes was doing this for the much of her run with Theranos. That is normal startup behavior, and not really unethical, and certainly not illegal, though it can be spectacularly misguided, as we saw. At the point where she started hiding what she was doing, it became "fake it till you make it" that is ALSO fraud.
So no. For chrissakes, Don't generally send people who "fake it till they make it" to prison.