Is Vivaldi Open Source Software? Myth Debunked!

So there is a disturbing trend in my YouTube comments. I have people telling me that I am wrong labeling the Vivaldi web browser as "proprietary garbage". They claim it is, in fact, "open source". Where do these people get this misinformation?

REFERENCED:
► https://en.wikipedia.org/wiki/Vivaldi_(web_browser)
► https://help.vivaldi.com/article/is-vivaldi-open-source/
► https://vivaldi.com/privacy/vivaldi-end-user-license-agreement/

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