Simple economic models show that it's possible to end up with levels of inequality that match reality, even when all the players are equally lucky and have no difference in character.
To twist the idiom: Hate some of the players if you want, but remember to mostly keep hating the game.
It’s simply not possible to reach anything close to a single billion without unbelievable exploitation of lower classes and it scales as you get richer. Saying “they got there by evil” seems completely reasonable by any moral standard not written by sociopaths.
Whatsapp's founders made $6.8B each from the acquisition, Whatsapp only had 55 employees when acquired who all got a big payout afaik.
What lower class 'got unbelievably exploited'?