Is it possible to make Collective content available to everyone with an external link - i.e. not only to registered Nextcloud users?
I don’t know the app nor do I use it but Nextcloud supports guest accounts and you might grant access for guests to the collectives app.
you alone decide whom to give your share-links… everyone you’d send a link has access to shared content.
If that is valid for said app? why not trying it?