BTW, it would be useful if DeepOnion starts to look for some partnerships among DeFi projects. It would also match the decentralization philosophy of DeepOnion.
ONION can be used as a collateral (it is like the value you left in the Defi platform) so user can borrow some other assets. after paying that lend you get your ONION back.
First step would be to ask Defi platform's people to tell what's the step to add ONION in their Defi platforms. As we know there are many Defi platforms now.