For federal taxes only... and with silly limitations that exist... because lobbying? And oh by the way, the IRS isn't actually offering anything, they'll refer you to third parties that will then make money off of you if you have anything beyond the most basic filing, and also if you want to file state taxes.
So no, they don't actually do that.
Why would the IRS provide a filing service for state income taxes? Go ask your state government to provide this if you want it. The IRS isn't the one collecting those taxes
They can't. Too much of the tax code is subjective and based upon claimed circumstance. If they did know this, they wouldn't need auditors.
> If you are the one who prepared them you absorb the liability when the IRS comes after you.
The liability is typically just the difference between what you paid and what you owe. It's hard to believe most people are so bad at taxes their efforts would be mistaken for willful criminal fraud.