Anything over $20 goes directly into cold storage. Sometimes I change this amount, but it's always a low amount. I'm not risking losing anything more than $100 USD; as such, not really considered closed or open source.

For the wallets I do use, I use only open source wallets. I wouldn't trust anything in Bitcoin that isn't open source TBH. Other software vendors in other industries may be able to get away with it, but with BTC (or other cryptos) the risk is just too real.