An article title such as "Popular open source software Calibre has a codebase that isn't just bad, it's outright dangerous" would definitely make me click.
If you feel strongly, please do this. It adds value. The creator might really benefit from it.
Sure you might benefit, but there are much more constructive, kinder ways to do it. Even if he and his code aren't great, Goyal's done a lot of free public service here. Let's not be dicks.
If you want to learn about the codebase, here it is https://github.com/kovidgoyal/calibre
They should be praised for their contributions, not torn down. That would be a dick move.
Forgive me, I have the flu and I'm grumpy today.
However, I would gladly read a post that reviews Calibre codebase in a helpful, friendly way.
There is an awful lot of self-deception packed into this paragraph.
> We would actually love to read that.
That part is probably true for many.