Paid apps can also steal user data and also myI’d be way way more concerned about ‘free’ mobile apps than open source programs.
Mobile apps can and will get a jarring amount of your data just for being installed.
I personally hate screenshots in technical documents. You can’t copy and paste any text in a screenshot, you can’t easily zoom in and often the resolution is not great.
It definitely depends on the context but please do not ever include screenshots of technical text instead of actual, useful plain text.