I just checked my account and the money I invested in the USD1 investment program has arrived. The reward is WLFI, paid out weekly. I calculated the return in my account to be about 15%. If you're participating, remember to transfer your USD1 to your futures account (no need to open a position) and then upgrade your account to a unified account.
Thankfully, the USD1 portion invested in the program has maintained its principal and is growing steadily; otherwise, the drawdown these past few days would have been significant. USD1 now supports many mainstream cryptocurrencies, so you can directly use USD1 to buy on dips.
Besides the investment program, there's also a USD1 points program that launched a few days ago with a prize pool of 12 million WLFI. The minimum guaranteed spots are gone, so only the trading leaderboard spots remain.