Crawling the Hacker News

Perfectly possible. Ethical? Different question.

Further, if you annoy hackers and they think you are being unethical, they may choose to take more "direct action".

Why would you do this anyway? If you actually do some work and invest some effort, somehow to increase the value, it would be less objectionable. Perhaps curate, summarise, then point at the original.

I just wanted to make it look more readable. Like that Chrome extension, just posted on some permanent url, so you can access it from anywhere.