If you don't want to be spoiled for atsv (across the spiderverse) I'd suggest to skip this and come back to it once you've watched the movie. You've been warned.
Theory for beyond the spiderverse: Prowler Miles on earth 42, where the spider who bit Miles was originally meant to be, was meant to be the one to be bitten by the spider instead of earth 1610 Miles. As Miguel said, Miles was never supposed to be bitten by that Spider, cause two Spider people cannot exist in the same universe as shown with the canon events. As spoken, if Miles was never bitten or the spot (bagel guy lol) never brought the spider to his universe, Peter Parker would still be alive and Miles wouldn't have become Spider-Man.
So yeah, I believe Prowler Miles who lost his dad in his universe since there was no Spider-Man to save him was meant to be Spider-Man until an uncanon event caused an issue.