Remember that moment in ITSV, when Miles first meets his world's Spider-Man and their spider senses do the thing?
The background behind Peter is as we'd expect; the classic red and blue.
But at first Miles' background is green and purple, two colors he's never associated with at all throughout the movie. As the moment goes on, it shifts to match Peter's.
We are literally watching Miles' fate change and the anomaly happen.
It's well established that the spider that bit him was not supposed to even be in that universe, meaning our Miles was supposed to be something else before it happened.
This isn't true for ITSV, but in every other version of Spider-Man, the main color scheme for the Prowler is green and purple.
Our Miles was supposed to become the next Prowler in his world. And the only reason he's not, is because of the original Prowler. Miles switched his fate with Earth-42 Miles.
