Looks like partnership with immunefi benefit Sovryn very much on this bug bounty program focussing on their smart contracts 
Sovryn Bug bounty with $1.25m massive Rewards:Immunefi's bug bounty program for Sovryn is live, take a look!
Security continues to be a major theme for Sovryn. Where other DeFi platforms audit only once, Sovryn audits on an ongoing basis.
It is focused around its smart contracts and app and the prevention of loss of user funds.
https://immunefi.com/bounty/sovryn/