That’s indeed confusing. The wording linked below suggests the eula is for packages distributed by owncloud. so to my understanding the source itself and any third party packages don’t need to care about it.
https://github.com/owncloud/ocis?tab=readme-ov-file#end-user-license-agreement
What?! All that noise about Switzerland mandating usage of open sourced software in gov (there was a great step, but it’s far from mandating anything) was already weird, now we are switching to linux? And caring about security and fiscal responsibility? There has to be another country called Switzerland than the one I live in.