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This is only true if you play with the default settings. An experienced gambler with a good strategy is certainly capable of making a profit.
No, what SquallLeonhart said is always true. No gambler can change the mathematics governing a dice game.
The house edge guarantees that the gambler will lose in long term. There's a simple mathematics. In a game with odds of 2, the chance of winning is always lower than chance of winning. In a game with 50% win chance, the odds are always lower than 2. More you play, closer you get to statistical distribution of outcomes and you will certainly lose.
Note that all bets are independent from each other. So, no strategy works. However you change the odds or chance win, the site has advantage against you.
PS:
I'm not saying the game is not fair. Freebitco dice game is provably fair.
The house edge is needed for every gambling site to survive.
The house edge in freebitco is 5%. But a big part of that goes to faucets, reward points, weekly lotteries, daily jackpot, monthly contest. There is also a Lamborghini lottery. So, the percentage of wagering volume goes to house is way lower than 5%.
If you have a large enough balance and a good strategy you can go a very long time without going bust. The house edge tells you how likely you are to lose but if your balance is large enough you can make up for those losses before you run out of money.