Ask HN: What do you scrape the web for?

Hey folks,

It's not rare for me to see myself scraping the web for both side projects and personal needs - checking whether the prices of the groceries are good or not based on the local supermarket's website; gathering some emails to cold-email about ideas ...

It seems to me that just by having the ability to quickly write some code to gather information from a government web page or anything that shows stuff on the web is a huge power.

What about you? Any great web scraping stories? Have you ever got in trouble by doing so? Made an entire company of it?