A few years back I got audited, and it was called an "electronic audit" by the IRS. Which basically meant that they had their computer systems scour a bunch of the bank records and discovered that I had forgotten to claim a 1099 for some contract work I had. OK, so they sent me a computer print out and they had cross checked everything on my return electronically, my property tax deductions, my stock dividends so on…
It's well known fact that the government can auto-file for most people, it's not really a secret. Many other countries do it, it's been proven to work just fine.
But don't worry, the project started in 2009 to replace their COBOL mainframe systems is kinda, sorta on track for completion...in 2030.