Disney wins in that scenario, because they have more resources to spend on getting their media out there.
As... Opposed to now?
If Disney does plagiarize small artists' work, and becomes known for it, they take a reputation hit, and the artist gets an explosion of exposure, as long as it is provable he made the original story. (Disney making million-dollar budget movies of your OC, isn't even that bad for you, to be honest, but let's assume that it doesn't market the fuck out of your small artist story. In real life, stories are not in competition.)
If Disney doesn't, then it's an undeniable positive for worldwide creativity.
The only thing copyright protects, is big companies' exclusive right to public-consciousness characters.
A "truly small" creator, would get , I dunno, let's say 5% of Disney's marketed sales, after being stolen from, from being known as the guy Disney stole from. Which would be enormously more than if he only had his "truly small" marketing.
A more successful and known creator, who would market himself more broadly on his own, would not be easy to steal from, since it would be quick enough for the stealing to be found out, to dampen Disney sales.
And all this, ignores the paradigm shift in monetisation (Uniquenameosaurus YouTube video), that could enhance this process immensely, and allow artist creativity to flourish even more, without even leaving the diseased economical rules of capitalism.
and irrelevant little aside
Also about this,Guns give some recourse to poor people, against the rich, because anyone could use a gun.
Guns allow the rich to equip their personal security teams, with guns.
Guns are not helping the poor, and neither does copyright.