Not sure how long it was brewing internally, but the decision to move from Presto to Webkit was publicly announced in 2013; von Tetzchner stepped down in 2010 & resigned in 2011.
> the fact that all businessmen, especially new one, also make honest mistakes
But yes, absolutely this. The repeated decision to forgo open-sourcing is (imo) a fatal mistake - it's the number 1 cited reason for people not switching to Vivaldi & also the real tragedy of Presto's shutdown: no possibility of a community fork - for what was an engine that always outperformed all competitors efficiency-wise (Webkit was faster when coupled with new hw & a brick tonne of RAM, but still knocks out even the fanciest setups today when you open more than a tab or three).
> the fact that all businessmen, especially new one, also make honest mistakes
But yes, absolutely this. The repeated decision to forgo open-sourcing is (imo) a fatal mistake - it's the number 1 cited reason for people not switching to Vivaldi & also the real tragedy of Presto's shutdown: no possibility of a community fork - for what was an engine that always outperformed all competitors efficiency-wise (Webkit was faster when coupled with new hw & a brick tonne of RAM, but still knocks out even the fanciest setups today when you open more than a tab or three).