I was jumping through similar hoops for a while to get Amazon smile donations, but then I looked at their numbers for how much gets donated and it was a pretty trivial amount. I don't remember what I found (anyone have any stats on Amazon smile donation percentages?) but I decided it wasn't worth my effort compared to adding an extra few dollars to my direct donations.
It's not bad if you connect it to an Amazon Business account. I give hundreds of dollars to the charity I select. Also it's a thing that's easy to opt-into with an extension and just goes on forever, so totally worth doing it.