If your deposits are insured, then sure why not? If Japan's able to enforce deposit insurance on licenced exchanges, surely a Gemini-backed entity must be able to do the same, especially if they're soliciting your deposits.
2% annual interest is not worth the risk, as pointed out. If you REALLY wanted to gamble, there is a service here that lets you earn about 4% annually (compounded), crediting you daily, and funds never locked. Hint: They're in Gambling section and are one of the most read and responded to threads. They've not scammed anyone for 4? 5? years but I wouldn't store my precious savings for that kind of interest. A little here and there, sure.
+1 this one. For me the service which offers withdraw anytime is better than that one, in any way deposit is still risk becausr unlike banks you have zero guarantee they won't go scam. But personally I would risk if I plan to hold my bitcoins and get rid of manual trading, but still, price is a little bit easier to predict now to my mind, you would gain that interest with some trade pretty soon.