it looks like scam
Most definitely not. I've already withdrawn LTC and can confirm I am making 200%.
This is the same provider of what was once the biggest BTC mining pool. Apparently they even became big enough to almost be capable of executing a 51% attack. The community became wary and decentralized the larger pools. Regardless, they went on to provide mining services, a trading platform, and other unique stuff.
Since they are coming a little late into the LTC mining game, it seems practical to release this kind of promotion for a lucrative company. They know miners will come.
I wonder how much of that double profit will be eaten by fees - those guys have very aggressive fee structure I think.
I am not sure what their fees typically are/were, but I know there is 0% fees on LTC mining. Not sure if that will continue after the promotion.
I thought the same thing when I saw 200% LTC profitability, but was reassured after reading further and seeing 0% fee.