seriously asking, should we worry about those "cex owned" non-custodial wallets like

TrustWallet by binance 
CoinbaseWallet by coinbase 

are they 100% open-source so we can "in code we trust"? (latest app store version) 

i don't think so.
(correct me if i'm wrong)

这是一个很好的问题！确保钱包的开源性对于保护您的加密资产至关重要。建议您仔细研究钱包的安全性和透明度，以确保您的资产得到妥善保护。加密世界充满了挑战，我们需要时刻保持警惕。