Are they happy enough that they tell other people? Are you tracking your Net Promoter Score? Are you doing UX studies? Are you giving people ‘delighter’ features like nightmode and offline support? Or are you making a toothbrush with a blade for a handle?
If you mis-use then users will uninstall your app. Use them to inform and assist users. Don’t obsess about CTR (uninstalls could boost your CTR since the only people left will be those who don’t mind your notifications) but instead focus on if your notifications are informative and/or actionable.
that makes sense and a description that’s likely to match the kinds of things people will search for. Cryptic naming, dropping letters or clever jokes are likely to make it hard for people to find you.