For example, this video https://www.youtube.com/watch?v=hB6eY73sLV0 by SethBling where he manually exploits SMW to rewrite some of its code and turn it into a Flappy Bird clone.
tl;dr: People can build ASM modules on that site and load them into my game (when enabled) using chat commands. And it does work on my original SNES by using some SD2SNES trickery.