Can I get free Lamborghini without risking losing anything?
Nope, you must wager at least 0.005 BTC to get 1 golden ticket, buy one or deposit 0.05 BTC.
You can get 1 free Golden ticket for every 0.05 BTC you deposit. As you don't have to wager that, so the tickets you get are free tickets.
By the way, this opportunity is not always available.
So one golden ticket will cost you 0.05 BTC which is roughly 400 dollars. This is not a small amount and i do not think one ticket is enough to win a Lamborghini. There may be whales who may use more than a BTC to get few tickets and this will make our chances close to zero. (Those who do not have much money to invest)
For me, getting Lamborghini from freebitco is a dream which may never come true.
As I understand it the 0.05 is a deposit not a price but as already mentioned it is not always available, so far it has run for 48hrs from notification by email, in my case anyway.