Most likely this is what needs to happen sooner or later. For now the existing iOS app can be used of course since it can connect to any ownCloud/Nextcloud server. Or any WebDAV app, for that matter cause we support open standards.

We will make sure though that this problem does not arise again since there will be a Nextcloud foundation which is in full control of the copyrights.

Disclaimer: I am the former designer of ownCloud and moved on to Nextcloud.