I contacted them. They replied:

"Yeah we don’t have sponsorships.

Just organizations that helped build the structure that we post “Thank you” bits for.

We’ve been very adamant on not having any sponsorship.

We just try and do mutual aid. "

"We could have, yes. But many people didn’t want their names available online but rather their companies. This has allowed other orgs in town looking to build community fridges the opportunity to reach out to folks familiar with the build. "