Using any platform is going to require you to do the same amount of work to file FAFSA. Frank won’t know your salary, assets, family size unless you tell ‘him’. Frank won’t know your bank balance until you input it.
The first time I filled out FAFSA I chose the .com extension rather than the .org so it wanted a fee for submitting. I quickly cancelled it all and think I was successful in not giving them my info, but I always worry.
Filling out FAFSA through Frank will not get you any more money as the info is the same whether you put it in directly or through Frank. No benefit to using Frank.