Because they know better than doing unpaid overtime, keeping up to date in an ever changing industry driven by popularity contests and having to work for free o

Because they know better than doing unpaid overtime, keeping up to date in an ever changing industry driven by popularity contests and having to work for free on some open source project because somebody thought that what you do in your free time is somehow more relevant CV wise than what you actually do for a living. I wouldn't worry much anyway. We won't be seeing many of those articles once the bubble bursts.