Let's be honest here. The people recommending Unstoppable Wallet do so because it's open-source. That's it. They have done none or very limited testing. I am not saying it's bad, but it's a very weird product that I personally didn't like.
Open source one of the most honest reasons when I recommend Unstoppable Wallet to anyone looking for a wallet that supports multiple coins.
Maybe a thorough test of the Unstoppable wallet lets us say there are people doing it on it, but we don't know how many.
Another possibility behind recommending Unstoppable Wallet occurred after the information submitted by theymos
Reminder: do not keep your money in online accounts.
Within the reminder message there was mention of the Unstoppable Wallet.