every single app on my phone: "Hey have you ENGAGED with us recently? No? Here's a notification to remind you to ENGAGE"
Reddit: check out this funny video lol!
Crunchyroll: did you know there's yet another high school drama out? It's so kawaii!
Solitaire: hey we added new costumes for the king and queen and our new jack is FIERCE
Stopwatch/Timer: hey did you know it passed 2pm today that is a very nice number
Seriously this Stopwatch/Timer app is constantly bugging me to rate it and upgrade to Premium, it's as if I bought a bar of soap and it started screaming "LOVE MEEEEE, tell me I'm the freshest soap you ever smelled"
FWIW I wrote a simple score keeper for Android and never included any ads or even charged a nickel for it, so I do put my money where my mouth is: https://play.google.com/store/apps/details?id=com.nolanlawson.keepscore&hl=en
The only time I ever tried putting ads in one of my apps, someone cloned it, translated it to Chinese, and changed the ad token so they could start making money off of it. Also it only earned like 5 bucks a month and made the app super ugly. After that I was like NOPE.