system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why don't video game companies use USB drives instead of CDs to install games?
gpt
CDs cost pennies to manufacture, rather than dollars for a flash drive.  So it's mainly an issue of greatly reducing costs on the manufacturing side of things.

Not to mention the fact that it's much easier to copy-protect a CD as compared to a flash drive.