Question: Who actually submits the documents? The 'How it works' is not clear.
"The application, upon completion, is sent to a SimpleCitizen-approved immigration lawyer for review to ensure users have the best application possible." ...But then what?
One of the reasons you hire a lawyer is so that lawyer can stand in for you. Part of that is that they can submit documents and requests on your behalf. Does SimpleCitizen seek power of attorney from customers? That would open a nest of licensing issues. Note the careful language. Are these "review" lawyers giving advice or not?