I'm not familiar with Urbit, but a quick glance at their website says that it's owned by the "Tlon Corporation," which I have to assume is a for profit company. Ethereum on the other hand is guided, but not owned or controlled by a non-profit foundation. Ethereum is a public utility and they have a mechanism for community involvement and contribution via Ethereum Improvement Proposals (EIP). Hope that helps!
Urbit has always been open source—currently under the MIT license [1]—and same as Ethereum it's also guided by a non-profit foundation, the Urbit Foundation [2] established in 2021.
This is very outdated and Tlon no longer operates/runs urbit.org but, in any case, the ToS says this: "The Site is owned and operated by Tlon", so the reference was to the website "urbit.org", not the Urbit project.
