Look at max bet (10.5BTC) on max odds (35:1) vs available bankroll (608BTC) there is your answer.

No it's not risk free. Manage your bankroll accordingly.


EDIT: Good news they lowered the risk of ruin. The site now only risk a maximum of 50% instead of 100%+ yesterday. I've never seen more than 1.5BTC bet on 17:1 and 2BTC on 1:1 so in reality they never risked more than 100%.

Risk of Ruin for Single-0 Roulette (player betting 1 on single number)

Bankroll	Risk of Ruin
0	81.605%
1000	17.216%
2000	3.547%
3000	0.75%
4000	0.258%
5000	0.083%
6000	0.025%
7000	0.008%
8000	0.001%

This chart indicates that if a casino wants to have a less than 0.001% risk of ruin, they must have a bankroll of more than 8000x the maximum bet on a single number.