If you’re a bootleg minifig maker and you’re dead-set on making production runs of sets of 8 minifigs per set, max, you’ll eventually run into problems with the Avengers movie franchise. With the second movie, you now have 10 main heroes to account for (including Fury), and that’s not even counting Falcon and War Machine into the mix.
And that’s also not including the Big Bad Boss, as well as other henchmen and enemy footsoldiers. SY made their cuts when they made their Avengers 2 set, and they stuck with the core heroes from the first movie, plus Ultron.
Interestingly enough, Dargo, instead of making their own set similar to SY to compete with them, decided to make minifigs that complement SY’s set. So the minifigs that weren’t picked by SY to be included in their set, Dargo did.
