No, thanks. Vivaldi is proprietary software and therefore not trustworthy. Since the source code isn't fully available, there's no way to verify whether an update might secretly add a feature that collects data. Since the source code isn't fully available and you can't compile it yourself, there's no way to prevent a feature that collects data from being secretly added during an update. The reasoning behind why it isn't open source is also complete nonsense. Just because it's easy to create a fork doesn't change the fact that most users will stick with the original as long as the fork doesn't offer significant improvements. With Firefox, people aren't flocking to the existing forks either.