I know Ko-fi allows you to publish PDFs and with free, PWYW, or set-cost options; they do take a 5% fee and there are processing fees on top of that, BUT one-off donations/tips on Ko-fi are always fee-free. So a little roundabout, but you could have a free PDF on their shopfront system, and folks could tip you through the one-off option.
Regardless, thanks for your work in putting out this awesome low-spoons resource, and thanks to tRaum for hosting it so kindly ♥