The shelf life of technology books is shorter than it takes to read them. Most were notebooks of students quickly edited into a learning tool. Oh wow more Python recipes. Another introduction to C++!

The worlds moved on from valuing the latest DSL and additions to the Linux kernel. Just a fad marketed at GenX and older Millennials.

SaaS is something tech billionaires need to exist. It's not something humanity needs. Not at the scale of the 2010s ZIRP fueled mania, anyway. Employers were using subscriptions to O'Reilly as a perk. No budget for perks in the AI and economic austerity era.

Maps app, communication apps, media consumption are all most of the billions of smartphone users care about.