Earlier quoted context omitted.
Amount of years old bugs with zero activity while they keep working on new features. Opera/Vivaldi CEO is really adamant about hiding both staff and user counts. Vivaldi even removed itself from User Agent string.
If memory serves, they removed the user agent because one of the Google properties was serving it substandard HTML/JS even though they use the Chromium engine.
All browsers wants to use a unique user agent.
It is the only way to prove market share => $$$.
But it is ridiculously difficult to modify it without breaking sites.
Take a look at your own user agent.
It is likely it identifies itself as gecko/mozilla/chrome/safari/IE/KHTML all in one.