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@attalis you have a valid point, lets wait and see. Also 1000 Ether is not a sure thing, it can be less. I'm just assuming but it should be possible to create decentralized pools that rules can't be changed. This is just the beginning and possibilities are endless.

I myself am environmentalist and I think its a waste of resources for proof of work. There are other, nature friendly options.

If the one controlling the pool has access to the funds, they could just take your funds instead.
The point is, you shouldn't be able to gain more than you can lose. So even if you managed to cheat and get 900ETH, it's supposed to be so you can never get more than 1000ETH, and your profit will always be negative(loss)