TL;DR: user contribution will go down, astroturfing will go up. Reddit is shooting its own foot, again.

The pic shows $6/gold, or $2/gold. Top contributors would get $1/gold. So Reddit is pocketing 50%+ of the value. Except that the platform kicked off the ones who'd actually contribute with it, so users will barely use the new system. You know who would do it, though? Corporations. For them it means "pay one dollar for advertisement, get half dollar back" is a treat. Astroturfing will get rampant.

To be eligible for the Contributor Program, you’ll need to be older than 18, live in a “supported location” (which at first is just the US),

I remember doing maths as this subject popped up; the program would exclude 70% of the userbase. And there are few things that piss people off more than feeling unrewarded - "you rewarded him, why not me? I'm not contributing, fuck off."

Rathschmidt said Reddit will use things like [...]

Except that nothing fucking works properly in Reddit. And Reddit will certainly not put reasonable measures against its own short-term profit, so that's likely just lip service.