This is sadly not easily generalizable, since a lot of people still use legacy operating systems with filesystems like NTFS, which as far as I know is not COW.
It's because of the old notion of "be generous in what you accept and strict in what you send". I think the error is something about adding more parent directories so that part of your zip file will be extracted above the selected directory. Not all implementations of zip support this "feature".
There are also all kinds of stupid ancient features in tar and zip from a time when hard drives were measured in megabytes or less. The latest episode of the open source security podcast talks about it.
The cherry stream, a simple keyboard that has keys that I can push without any extra crap, is my by far favorite keyboard. It's quiet, shits the fuck up to let me work, and it's cheap. I use it at home, I use it at work, everyone in my organization uses it at work.
Thats not necessary for online teaching. I just got my degree and there were some online courses too, never had to deal with any of this anti cheating crap.
I fucking love tagging people