I'm not really knowledgeable about all this, but mining of PoW currencies right now seems to rely a lot on mining pools. Isn't there a risk that they are "the r

I'm not really knowledgeable about all this, but mining of PoW currencies right now seems to rely a lot on mining pools. Isn't there a risk that they are "the rich" and people trust them? What's the difference with PoS there?