Yes... yes they will. And that's the fun part.

A glitched session stands separate from a run-of-the-mill play session.

Broadcasters on Glitch are playing to entertain. They are streaming to a live audience and that audience has tools to alter the game. This might be player vs environment, or player vs player. Either way, it ain't gonna be a fair fight. If the viewership isn't on your side you're going down in flames.

And loving it... As a broadcaster your share of the remuneration pool is based on interaction with your broadcast. If viewers are glitching you, your share of the remuneration pool is going up.

It doesn't. Developers alter their own game / digital world any way they see fit, then connect a session to the glitch platform.
Glitch is a tool to bring a live audience to that broadcast and trigger game defined actions at the whim of that audience.

The effect may or may not be instant, but there will always be some form of delay between the viewer taking an action and seeing the results of that action in the stream. The action has to take effect in the game, the player then streams that game out over a series of tubes that must transcode that video signal and whisk it all the way to your waiting eyeballs. That takes a little while. Glitches are designed to take this into account. The audience isn't playing the game, they are effecting the game.