What does HN know about https://www.voting.works/ ? (open source/hardware voting machine)

Note, they are also trying to change the USPS rules regarding mail-in ballots, such that the USPS will not deliver ballots either direction unless the recipient is on a list they are allowed to make. Public comment is open until July 2

https://www.regulations.gov/document/USPS-2026-1289-0001

What does USPS assume for chain of custody for a ballot? Do they hand them directly to a person?