Adding a layer of security when trying to access the app would be a very nice addition. I see that it was a talking point back in '16 but with the improvement to touch id and face id adding another layer of security would be preferable, as right now anyone can open the app.
What does everyone think?
I totally agree
I thought the iOS version already supported TouchId and FaceId?
Not sure. I only use the Android version.
Ah, then yes as far as I know iOS has both of those with an Android version being a mid-term task on their trello board.
Blog post: 2018 plans
Plus, weâll be working to bring fingerprint support to Android this year
Donât forget about using the search, because the discussion definitely continued in 2017.
I hope Iâm not going to be forced into taking selfies of myself before I can use the app!
Anyone can open the app?
Open the app, Account screen, Settings, âRequire Touch ID to unlock appâ - is that what you want to change?
Edit: oh, this wonât help you on Android
Careful you donât drop that can of worms youâre holding, some of them might get out 
Fingerprint or password unlock works fine on my Android thank-you-very-much 