The 'spying' here is nothing more than using an analytics service called Clevertap. I haven't come across many apps/websites that didn't do so, in one way or the other. It's a fucking industry. If tracking the activity of an app's users would amount to spying, then I guess entire fleet of third-party SaaS services would need to go (Mixpanel, Amplitude, Zendesk, Intercom).