Not really sure, but their developer page claims that the wallet is open-source[1]. If it's accurate, then it's definitely a positive thing.
It used to be open-source in the past, but that's no longer the case. Neither their Android nor their iOS version have publicly verifiable code.
https://walletscrutiny.com/android/com.wallet.crypto.trustapp/https://walletscrutiny.com/iphone/com.sixdays.trust/...but when it comes to multi wallet I haven't find a wallet that's open source and supports 100s to 1000s of tokens, if I am wrong someone should please drop a name.
I have no idea how many altcoins it supports, but
Unstoppable Wallet is a mobile multicurrency wallet that is supposedly open-source.
Wallet Scrutiny wasn't able to match the binary to the source code for their
iOS app but they did it for the
Android version.