> I'd add that these days it totally makes sense to download libgen's entire archive, because (1) storage has never been cheaper, and (2) you can use it to train local LLMs.
Hardly. Data hoarding comes with most downsides of hoarding physical objects. It's just smaller, cheaper & easier to process.
There's people that get rid of any physical object they haven't used in the past year (or 2, or 5, whatever). This makes sense. Imho, every object you own falls in 3 categories:
1) Things you use on a (semi?) regular basis. They make your life easier/nicer.
2) Things that are valuable. For flexible metrics of what constitutes value (sentimental, nostalgia, monetary, insurance against 'disaster', ...)
Not having used something in a long time is a good hint it's not valuable.
3) Luggage. Whose value is negative. It doesn't provide anything, just takes up space, drains mental energy (and possibly other resources), and in doing so gets in the way of other pursuits.
Data is no different. For any single piece of it, you either use it from time to time, somehow derive value from it, or it is useless luggage that you drag around at a cost.
Apply good judgement in what to hoard.