Mario's entire life revolves around collecting money and propping up the monarchy, how could he be a Communist?
Because you aren't imaginative (and paranoid) enough.
Who were (and still are to certain people) the embodiement of greedy fatty ugly big-nosed capitalists for bolchevik propaganda?
And who happens to have a "w" in his name in the mario world?
And what does he look like ?..
Mario rescuing the princess peach?
In later mario incarnations, maybe.
But in SMB, she is Anastasia, the long lost last princess of russia, which would have hidden deep in the sewers to escape the soviet revolution.
But why a son of the People would help the last remnant of his previous dictatorship?
Because of her populatiry within the masses, and some guilt to have mercilessly murdered a whole family in some forests. Historic rewritting for redemption is a common behavior when even the victors feel some culpability.
Why is mario collecting money?
Answer: he's not.
He's finding them to redistribute the wealth to the toad people.
Toad people, which happens to look like small burly minors, working hard under the oppression the green monsters.
What's the color of american dollars?..
Yes. GREEN !
Honest toad people turned into brainless horrors who can only run forward to a certain death, blinded by their reptilian oppressors and their empty promises of wealth.
Like a specie which will soon become extincted, with the help of brave and red plumbers from all over the world.
But what's the link between a turtle and america? None.
But the snake, an insidious, lying agent of mischief and treachery, is certainly fitting the bill in the eyes of good bolcheviks.
The hovering godlike figure sending walking plagues to the world under, and who gets dethroned by a single jump?
Christianism getting stomped!
Or how a mere commoner can replace the omnipotent within a single leap. And the willpower of a true revolutionaire, of course.
What's about the invincible (communist) star ?
The fire (red) flower ?
The ivy, skyscraping product of a diligent farmer, working like a stakhanovitch to receive mother country's gifts ?
So many coincidences !
So many evidences !
For all those years, our children have been brainwashed by sleeping communist agents.
AND NOBODY SAW IT !!!!
AND NOW, POUTINE IS COMING TO REAP IT AAAAAAALLLLLLLLLLLL!!!!!!!!!