Does buying the book give you license to digitise it?

Does owning a digital copy of the book give you license to convert it into another format and copy it into a database?

Definitions of “Ownership” can be very different.

some dude out of Silicon Valley hears about this, and hacks up a system that just uses a $30 webcam, an AI model that detects fingers (trained exclusively on pudgy white fingers of Silicon Valley executives)

Hotdog / not hotdog

T2. Alien. Predator. John Wick.

You are missing a piece of the analogy.

After each key press the size of the letters change, so some become more likely to be hit than others.

How the size of the keys vary is the secret being sought, and this training requires many, many more monkeys than just producing Shakespeare.