Two ways to give: straight to the maintainer, which is not tax-deductible, or to the nonprofit Sponsor-a-Can, which is.
Donation page. Reads the giving routes from /data/donate/routes.json, the other direct links from /data/donate/methods.json, endorsed charities from /data/donate/charities.json and the FAQ from /data/donate/faq.json (the same four files the desktop app's Donate page reads), plus the connected server's funding block from /api/server-info.

Give to the maintainer directly (not tax-deductible), or to the nonprofit Sponsor-a-Can (tax-deductible).

HumanityOS is fully open source: view the code.
No funds are held on behalf of donors.