The new add-in integrates Nextcloud with Microsoft Teams, allowing users to effortlessly share files and folders stored on their private Nextcloud server directly from the Teams user interface.
This effectively replaces OneDrive (and similar proprietary solutions) with Nextcloud, IMO.
MS Teams is the privacy issue. How you share files in combination with it doesn’t really matter that much.
Since the alternatives are sparse and Companies are basically forced into Teams, this offers at least a private and self hosted solution for filesharing within Teams.
Not everything is black and white.
The post is about Nextcloud self-hosted file storage as an open source replacement for One Drive which is deeply integrated with MS Teams. For those, who can’t replace MS Teams with FOSS equivalent for whatever reason, can at least stop relying on One Drive for file storage solution.
And, for your information, Nextcloud does offer 1:1 and group chat solution[1], which is an open source replacement for MS Teams.
[1] https://nextcloud.com/talk/