The Linux (and LAMP, etc.) adoption happened before YouTube, Stackoverflow, ChatGPT and the other recent ways that people decide what tools to use, when they have a choice.

Agreed, the tools you learned in school influenced what you use in your job (when you had a chance to influence that), and that was understood by marketers since before Linux. I even know one top CS department that was threatened by a major software company of no internships and other sanctions, if they moved to Linux rather than teach classes with that company's software, and the company seemed to follow through on the threat when the department did Linux anyway. (Nowadays, CS departments are run more like vocational schools, or hoping students do startups, and are generally teaching whatever tools they think industry is using at the moment, rather than leading.)

Related: Apple aggressively getting the Apple II series into schools, influencing what's bought in affluent homes, even before the students are old enough to get jobs.