@gsprs @TritTriton @user365 @Vivaldi > you can check it for yourselves.
In what they hide is nothing, IMO, that non-expert "can check for yourself". Even if one is an expert who is able and wiling and have resources, the others must trust in that person expertise and integrity no less than they must trust in expertise and integrity of the whole Vivaldi team. The fallacy of "open for security" is that, a fallacy. As well as "it is open, someone had to look through that code". I am (was) an expert hence I know that I have no knowledge, time and skills that would let me "check for myself" even a promille of open sourced code I used. Nor I have illusion that many others already did it for me. Details to be found in Heartbleed popular nerdpress.
I trust Vivaldi team will spot the danger if Chromium owners would come rogue (or hacked, or compelled to be evil). Because so far they are only EU based team having means to keep on doing it. I wished they can use EU's Norwegian Fund, but afaik they cant. I personally am ok with the explanation and rationale laid in the Julien's post. Godspeed!