Every.org Lists is powered by Every.org, a US 501(c)(3) nonprofit. As a US 501(c)(3) organization, legally we can only grant to other 501(c)(3), not to individuals, lobbying organizations, or political candidates. If your nonprofit is based outside the US, you can still get 501(c)(3) status yourself, either by applying yourself or getting a fiscal sponsor.
When you donate on https://list.every.org/, you are actually donating to Every.org, a US 501(c)(3) charity with EIN 61-1913297, which is how you get a single tax receipt for your tax deduction. Every.org does not take a cut and divides your donation equally between all the nonprofits who are on the list at the time of your donation.