Yes but those letters could have a response that says “you have been charged 1million in fees and a 30% annual charge until you pay them back or face prison eventually..
This article shows us how many are not filing but not the repercussions.
Discussion
Almost no one goes to prison for it
Those that do are the filers more than the non-filers
Maybe it'll change, but I'd prefer prison to filing income tax anyway
About half the country or more doesn't file