Here is what I use it for:
- Download top voted pictures from CivitAI
- Pull weather data and get notified if it is going to rain
- Subscribe to events posted by the police (polling their API)
- Scrub lunch restaurants for todays menu
- Get notified when a streamer I follow on twitch starts streaming
- The same for YouTube but I haven't finished this one yet.
- Webhook (combined when a one file web page) to note down every time my oldest kid has this strange coughing.
- Send me this week's number (because some people use it and knowing that today is week 50 can be useful a few times a year).
I use ntfy for my notifications. I was also planning to monitor if I sold anything in Guild Wars 2 but I haven't bothered setting up a table in a database to keep track of if I have seen the latest changes, otherwise I would get the same notification over and over.