You joke but I bet whatever software unions use to track member dues and involvement is in dire need of a 2022 upgrade. Everything from soliciting donations, text chains, to coordinating work stoppages. And charging SaaS-style per member makes perfect sense.
I’ve done a bit of consulting in this space. It really depends on the union. Some are stuck in the 90s but some are doing all the fancy modern stuff you’d expect. And yes, there are SaaS tools aimed at the union market that charge per member monthly fees.
Hey! There's nothing wrong with that spreadsheet created way back in the 80s that keeps track of dues payments. It was probably even created by Hoffa's executive assistant.