Unfortunately, you'll have to wait a bit on FS. They got way more volume than they anticipated with their alpha and closed it early. I believe the original plan was 28 days. The alpha test revealed opportunities for traders to do something called 'backrunning', and it started to get costly for liquidity providers instead of providing a profit. No hacks, but they know several things they want to change before their beta launch. I'll ping you when it does.
No one in crypto treats 'alpha' like 'alpha' or 'beta' like 'beta', however. I'm guilty myself. :)
If i understand correctly, you basically become a lender and earn returns, as if you were the bank? And the platform "guarantees" your investment.
If trading remains un-gamed, then yes. If you put X USD in, you should get X + n USD out. That was the case until yesterday, when n turned negative.