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Unity bosses sold stock days before development fees announcement
(www.eurogamer.net)
This is a most excellent place for technology news and articles.
How's that even legal.
Usually people at a company are not allowed to sell stock except during special windows. For people at the very top it's restricted even further where they need to essentially plan to buy/sell stock well in advance. Essentially there is a huge delay to any stock decisions. So these sell offs were likely decided far in advance and once locked in cannot be changed.
For more details read https://www.investopedia.com/terms/r/rule-10b5-1.asp
the sale might not have been shady if scheduled, but the timing of the announcement which they have complete control over IS shady as fuck.