You can buy his work DRM-free, and much of it is public:
https://www.gutenberg.org/ebooks/author/3826
https://archive.org/details/cory-doctorow-content
I happily pay him for hardcovers though.
I do not believe copyright makes any sense in the global post-internet world.
It is a major hindrance to progress. The many countries that do not enforce copyright law will share everything that can be shared and are going to progress much faster than the US in the long run.