So what does it mean by "line by line review" that is offered by the standard live product?
If turbotax preparer just review and does not sign it means there is no accountablity and people call this ghost preparer.
Here is for reference
https://www.ctec.org/taxpayers/did-your-tax-preparer-sign
Tax preparers who charge a fee to do your taxes, but never sign your tax return are breaking the law. No signature? Means no accountability. No proof of existence.
Hiring a tax preparer (often referred to as "ghost tax preparers") will increase your chances for tax fraud, penalties and additional taxes.
