This seems like a very valuable bit of info to have!
I haven’t thought about this for long, but I’m not actually sure which way a system like this would go.
I know that when a bunch of random variables are added together then that will result in a normal distribution, and when a a bunch of random variables are multiplied together it’ll give a log-normal distribution, but I don’t know which of these is a better model for different pain intensities in a given pain event
Personally, I know I’d rather make the decision of donating once, and forget about it, rather than having to decide every day. I know if I had a daily notification asking me to make a decision I would quickly get rid of it, as I find those sorts of things exhausting after a while. But maybe there’s a personality of people who like these sorts of prompts and appreciate micro-decisions.
On the other hand, maybe some people are overwhelmed by the idea of donating $1500/year, but $5/day seems fine, so they’d be into this.
For people who like the sound of $5/day but would soon mute the notification, there could be a way of toggling a switch to automate the process of donating the 5 bucks, but maybe that’s missing the point of your idea?
You’d probably need a way of getting around credit card fees, as I think these have a fixed price so making lots of small transactions isn’t very effective?