Trust wallet is not open source.

Here is their blog post announcing they are becoming closed source about 4.5 years ago: https://trustwallet.medium.com/why-open-sourcing-android-app-could-be-a-harm-to-the-crypto-community-fb3ae1707dc6

Here are the links to their Github repositories which show they are both archived and have had no updates in 4 years:
https://github.com/trustwallet/trust-wallet-android-source
https://github.com/trustwallet/trust-wallet-ios

They outright lie on their website when they claim to be open source. If being closed source isn't enough to convince you to stay away, then them outright lying to you should be. They are also owned and operated by Binance, so you can guarantee you will have absolutely zero privacy when using Trust wallet.

Avoid it.