The Nextcloud comparison seems weird, given that Nextcloud is foremost a file hosting/sharing thing, which your project doesn't seem to have, or at least doesn't present as the main thing. Why compare to a product that does something different instead of about what you do?
Huh? Nextcloud has mobile and desktop clients, including end-to-end encryption, lots of features around sharing files (both publicly and inside organizations),...
They don't have end-to-end encryption for their contacts, calendars, tasks and notes, which is what EteSync does...
Anyhow, I changed the title.
Regarding the comment you were replying to: the NextCloud clients, for all I know, don't actually sync with your filesystem, they just have a UI for accessing your files.
The Nextcloud comparison seems weird, given that Nextcloud is foremost a file hosting/sharing thing, which your project doesn't seem to have, or at least doesn't present as the main thing. Why compare to a product that does something different instead of about what you do?