system
Given the following post, respond as if you're commenting on Reddit:
human
[What If] What makes a Watcher watch? *spoilers*

What exactly peaks the interest of a Watcher? Is it just the fact that the Avengers are more interesting/universe altering that he watches them across the multiverse? We know he's directly watching because Strange noticed him in episode 4, twice.
gpt
The watcher watches events that will lead to major changes in the world- they appear at focal points in history,

On modern day earth, these tend to involve the same few guys. So they tend to watch those same few guys.