I read about it in Whole Earth (wow, they don't even publish any more!) Used to get Global Mail Art and Factsheet 5, then used some online lists. Tried Swap-bot and Postcrossing, but I don't always have internet so those were difficult. So hard to find anyone using actual materials any longer. Seems like everything is online or digital and boy do I miss getting unexpected random mail. I don't always answer calls, but send me something and I'll send something back.
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The money will be used to keep the IUOMA-platform alive. Current donations keep platform online till 1-aug-2019. If you want to donate to get IUOMA-publications into archives and museums please mention this with your donation. It will then be used to send some hardcopy books into museums and archives. You can order books yourself too at the IUOMA-Bookshop. That will sponsor the IUOMA as well.