It seems that winners don't actually get the million-dollar prize due to taxes and rules, and that also applies to Season 19 winner Richard Goodall. There's a disclaimer that flashes by at the foot of every single episode of the contest that reads in part,

Richard Goodall became the winner of “America’s Got Talent” Season 19, defeating magician Solange Kardinaly, comedian Learnmore Jonasi, and other finalists. Goodall, who has been working as a school janitor in Terre Haute,

Speaking to The U.S. Sun following his victory, the singing middle school janitor was asked if he’d be interested in a film about his life, similar to the productions made about Britain’s Got Talent winner Susan Boyle. The interviewer even suggested Zac Efron could play a younger Goodall.