They seem to NEVER run out of the damn things.
They make one for a single character....then for a team of single characters...THEN one for teams of characters against teams of other characters...
THEN THEY REBOOT one of the characters with a new actor, and then they make prequels, and sequels. Then the movies where the good guy turns into a bad guy!
Marvel an DC must have dozens of minor characters to tap.
And it’s amazing that these movies do so well. Three Spiderman actors in 10 years, and it still made a fortune.