I don't know if it's just ethical or their unwillingness to improve but they have left a lot of issues open for several years.
Issues like -
Auto dark mode for web pages - they removed it when Chrome for Android dropped it, but never picked it back up. All other browsers have it now
Geolocation on Mac. Their argument is weird for this and the issue is still there for over 5 years
A lot of changes nobody asked, something like address bar auto complete, which they forcefully changed to top sites without even giving options
Slowdown because of bloat - while a lot cliam that it isn't the case, Vivaldi has brought my M1 Mac to its knees, even with brand new instace. Again only one to do so
I really like Vivaldi. Their management even seems kinda ethical.
absolutely proprietary
Vivaldi.com/source
"Vivaldi browser is part open-source, part closed-source" They can make it sound great, but in the end its not. https://vivaldi.com/blog/vivaldi-browser-open-source/
I don't know if it's just ethical or their unwillingness to improve but they have left a lot of issues open for several years.
Issues like -