Here's why:
* Early Tron: The original Tron film (1982) primarily used blue for the user programs (like Kevin Flynn) and orange for the MCP's programs (like Sark). This was mostly driven by visual design choices for the film's limited CGI technology. It was not intended to represent a specific faction or hierarchy.
* Tron: Legacy: The sequel introduced a wider range of colors, including the blue and orange we saw in the original. However, there was no clear correlation between suit color and a program's role or allegiance.
* Tron: Uprising: The animated series continued this trend, featuring a diverse range of colors with no direct connection to a program's alignment.
Ultimately, suit colors in Tron are primarily for aesthetic purposes and visual differentiation. They add to the visual identity of the characters and their world, but they don't necessarily hold a specific meaning within the Tron universe.