This is very sustainable and should be up for another year. It's sustainable and big names like Coinmarketcap.com and others have invested. Also it doesn't give a crazy return which is a plus and you can get your money hourly.
On the other hand it is on the tor domain and is completely anonymous as well is the creator. It's been running for over 3 months and I trust it.
Invest at your own risk, don't invest if your too nervous. I'd try to start out with minimum and see ho you like the service. I love it and it pays out well.