This is extremely misleading. "Membership" is about direct contribution to and influence over the non-profit; it'd be somewhat analagous to being a GitHub shareholder. The very first question on Codeberg's FAQ [0] makes this abundantly clear, as does the "Join" page [1]. I don't see any part of the website you could go to to get any other impression.

[0]: https://docs.codeberg.org/getting-started/faq/#what-do-i-nee...

[1]: https://join.codeberg.org/