Nothing specifically wrong with the app, I simply don't want to be seen to encourage the downloading of ANY app, especially when the Web site makes it seem like the only option as this does (when accessing from a smartphone).
I am not of the tin hat brigade, but working in IT I am aware of what I may not be aware of in regard to what goes on "under the hood" when using an app.
This can be somewhat controlled by employing suitable Web browsers when accessing the same sites.