Had Loki defeated the Avengers, and crowned himself King of Earth, how exactly would daily life have changed for the Earthlings?

You mean like the premise of this week’s episode of What If…?

Some other super heroes, or villains, would take on Loki every other week. Life would be like Dr. Dooms citizens of Latvaria.

We have a hulk. This would not happen.

@cookieman
It is an example.
@Blackwater_Park
In the last episode, The Hulk got exploded by Yellow Jacket. The latter also killed Iron Man, Thor, Hawkeye, and Black Widow.

not so sure

Hulk bursting like a water balloon

Loki dies

Loki defeat the Avengers? Ha, ha ha! Both Thor and Dr. Strange took him down in a matter of minutes without batting an eye on different occasions.