I don't understand what he is doing. Is he sending the Bitcoins back without any fees so it never gets confirmed?
Can't someone just send any amount and use RBF in the "doubled amount" to make the tx get confirmed?
He pushes transactions that seem valid to Blockchain.info, however aren't valid on the bitcoin network as a whole. As you can see, this transaction from 'Bitcoin Magic Doubler' is valid on Blockchain, however the same transaction is not found on blockr or Blocktrail.Can't someone just send any amount and use RBF in the "doubled amount" to make the tx get confirmed?
Why only blockchain.info users? Is this his method to scam or he's just trolling?
That is why.Why this forum did away with the scammer tag is beyond me.
Because:1. It had to be applied by administrators. I'm sure you can see by the speed of account recoveries why this wouldn't work.
2. If applied by a central authority, the scammer tag would have possibility for bias. With the trust system, if you do not believe someone's ratings are appropriate you can remove them from your list. You cannot do that with things applied by administrators, such as scammer tags.
At least then it was completely obvious and no interpretation or reading was required. And it's not like it's difficult to determine who's a scammer.
If people are too lazy to look into the people they're sending money to, they arguably deserve to be scammed. A fool and his money are easily parted. 
