- I like the overall idea and execution seems great. It's even free so you're reducing a lot of friction, great job.
- My gut reaction is that except in very few settings, once a day delivery is going to be problematic. Perhaps a once an hour, or once every 2-3 hours delivery could be supported. Unfortunately that will defeat the entire purpose, so am not really sure. I guess you'll have to just wait and watch how it's being adopted and adjust if needed.
- Not sure how the backend works, but if you're pooling all requests for delivery at the same time you will have very high peaks with mostly idle time in between. Am curious how you are adjusting for that? AWS Lambda??
- How about delivering the messages via email over SMTP, so that this becomes an email client and takes care of having person at the other end also having Pony. A lot of people may like reading/drafting emails at quiet times, periodically say every 2 hours. Again, this is not inline with the original intent of this, so not suggesting you change anything just something to keep in mind depending on the traction you get.
All the best!!