I don’t disagree. The topics are a bit hit or miss and yes, my newest free ebook from them is from 2020, so all contents should be taken with a grain of salt. I did manage to grab some on C++, Machine Learning and different Pentesting tools, so not everything is completely obscure but as you said, usually they do not choose their most recent books. I see it more as a nice free resource on some topics in the books as of course not everything will be entirely out of date. It’s also not necessarily worse than buying their 2023 books today and using them for the next 3 years… That’s just a general problem with tech books, at least these outdated books are free.
Why would they normally run into 6000+ subs going private? I’m sure they tested that their code can generally handle some (usually smaller) subs going private, but the number and size of the subs going dark isn’t a normal scenario and I doubt anyone would have assumed such a successful and coordinated protest involving some of the biggest subs would even be possible a few months ago.