What's the difference between this and ethereum? what can you do with this that ethereum can't?

I came across some site which is like a bitcoin washing site but peer to peer, the site itself acts like an escrow and allows people to trade apparently 'dirty' bitcoins(maybe from hacked wallets im thinking or stolen, scammed etc) for 'clean' bitcoins. Now i don't know if it's legit the whole idea of it. I always thought bitcoins were anonymous either way why would someone even do that and lose 30 coins?

Although I'm quite new to this stuff so if anyone knows more about this stuff I'd be happy to hear your opinions/experiences on this.

Has anyone ever used http://mining.securepayment.cc/? if so please let me know if they're legit or not. I was wondering if they can, for example, discover a block and not tell me about it so they keep 100% of the block reward... is that possible?

Hi, I'm a bit new to all this, just wondering is there a software to automatically mine altcoins?

Regarding the reason I think bitcoin creators might increase the limit, it's because if they do, can't they can make a lot of money by doing so? Can they just introduce a number of bitcoins into their own wallets etc?

Hi guys I'm just wondering is bitcoin creators able to lift or increase the limit of the number of bitcoins which can ever be produced(21,000,000)?

When you answer, if possible please also let  me know how sure are you about the answer.  I need some advise on this. Thanks.