CtCI has been first published in 2008, meaning that such interviews had already been widespread for a few years by then. Since then, websites like Leetcode have

CtCI has been first published in 2008, meaning that such interviews had already been widespread for a few years by then. Since then, websites like Leetcode have apparently become viable as businesses. As a career choice, I find it unwise to bet on this practice disappearing anytime soon.