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Dropbox removed ability to opt your files out of AI training
(news.ycombinator.com)
This is a most excellent place for technology news and articles.
You can easily repurpose old drives for this. I started my server scavenging drives and using my laptop. I upgraded to some WD NAS HDD and I'm about to upgrade to a better Synology NAS.
There are options for people wanting to start hosting.
The idea that many people have old drives is already assuming a lot.