It can be turned off

One answer: People love their defaults. Computers come pre installed with Windows, MacOS, (Bad) Android. Creative professionals are trained on Adobe Suite. Business professionals are trained and certified for MS Office and SaaS ERP Software. They don’t look beyond the defaults because their goal is not to determine which software/tool gives the most value or teaches them the most but which software/tool is the default that will give them a job and unfortunately FOSS is not the default for 90% of those people.