The idea of killing half the cosmic population to prevent cosmic overpopulation is absurd. Try utilizing all stellar energy first. Also, people in affluent societies control family size.
What is good is how Marvel has combined all these characters in a single continuity comprising so far nineteen feature films and one (later: many) TV series.
Apparently, the symbol on Nick Fury's phone refers to a Marvel Comics female Captain Marvel. There is a distinguished literary sequence:
Hugo Danner in Gladiator by Philip Wylie;
Superman;
Fawcett Comics Captain Marvel;
Mick Anglo's Marvelman;
Alan Moore's Marvelman.
This sequence has many offshoots, including Marvel Comics Captains Marvel.