Security by its very nature has a problem of knowing when to stop. There's always better security for an ever increasing amount of money and companies don't sign off on budgets of infinity dollars and projects of indefinite length. If you want security at all you have bound the cost and have well-defined stopping points.
And since 5 security experts in a room will have 10 different opinions on what those stopping points should be— what constitutes "good-enough" they only become meaningful when there's industry wide agreement on them.
We can’t all have the latest EPYC processors with the latest bug fixes using Secure Enclaves and homomorphic encryption for processing user data while using remote attestation of code running within multiple layers of virtualization. With, of course, that code also being written in Rust, running on a certified microkernel, and only updatable when at least 4 of 6 programmers, 1 from each continent, unite their signing keys stored on HSMs to sign the next release. All of that code is open source, by the way, and has a ratio of 10 auditors per programmer with 100% code coverage and 0 external dependencies.
Then watch as a kid fakes a subpoena using a hacked police account and your lawyers, who receive dozens every day, fall for it.
The budget that it takes to protect against a script kiddy is a tiny fraction of the budget it takes to protect from a professional hacker group, which is a fraction of what it takes to protect from nation state-funded trolls. You can correctly decide that your security is “good enough” one day, but all it takes is a single random news story or internet comment to put a target on your back from someone more powerful, and suddenly that “good enough” isn’t good enough anymore.
The Internet Archive might have been making the correct decision all this time to invest in things that further its mission rather than burning extra money on security, and it seems their security for a long time was “good enough”… until it wasn’t.
If that happens you need to seriously rethink your hiring process.