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While it may not be a scam in your opinion, it could be considered spam. Spam is not appreciated by the community and could be flagged or may result in action from the cheetah bot..

A scam or not ?

ltcminer.io and bitminer.io (the only ones I've visited) both promise R.O.I. in only 4-5 days on unlimited mining. How on earth is that possible?! The eyeball test and the smell test scream SCAM to me. I'll bet that those "free" coins never find your wallet.

beware ..if they ask any amount ...don't pay ...if you get free then its yours :)