I think Trust Wallet is trusted....
The fact that you can only trust it, and not verify it says enough. Especially when there are reputable software already out there, which leaves you room to question them. This very fact counts as an argument on why I, on the other hand, don't trust TrustWallet developers.
Because there is still risk, where for example Trust Wallet has our private key on their server, then get hacked.
Why don't you just go with an open-source, reputable wallet software, like Electrum for example? It's just irresponsible from your side to use such crap when there are far better alternatives.