No. It's not Open source at all!
From Open source definition: "The license must not restrict anyone from making use of the program in a specific field of endeavor. For example, it may not restrict the program from being used in a business, or from being used for genetic research."
Source: https://opensource.org/osd
Nextcloud calendar
I really wish was a Free Software and not a proprietary one!
Discord is a mess and very hard to use. Element in the other hand is designed logical and easier to learn.
The hell with android apps. In my last year with Droidian, I got better replacements for any single app I used on Android!
I'm daily driving Droidian for more than a year!
F you! We even celebrated it in Iran