Utrum wallet is secure and we have no issues from past 9 months.
It is important to keep your seed safe. It is the only way you can secure your funds.
Holding rewards will lock your OOT on blockchain, so its secure, no one can access your funds.
Kind of a simple and short explanation from the utrum team, that means that you have no worry about the breach activity on the site because it is safe, but I wonder if your site has bypassed by hackers team, would you return OOT to users?