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Since a good bit before 2014, even. They used to recruit very heavily from MIT (while Palantir was overrepresented at Stanford and Quora at Harvard--all of these reflecting the almae matres of the founders). Note that this was before the popularity of Leetcode and the whole cottage industry around trying to game algorithmic-type interviews. I'm not sure if similar companies founded today would push these algorithm-heavy interviews as hard, since they've probably lost some signal now & prevailing attitudes have changed a bit.

At any rate, it doesn't surprise me at all that Dropbox engineers do better than FANG engineers on these technical metrics. The average Dropbox engineer is almost certainly a bit smarter and a bit better at algorithms than the average FANG engineer. Of course those attributes don't automatically translate into being a better engineer, though, nor do they automatically translate into company success or anything.