What you get
A run reads the comments on one Blind post. Each comment becomes a row with its text, the nickname and company Blind shows next to it, likes, date, and the comment it replies to, so the thread keeps its shape in a spreadsheet. Copying a thread by hand loses the companies and the reply structure, which are usually the point.
People use it to keep a useful offer, layoff or interview thread as a file, and to read how a company's employees describe pay and culture. Blind is anonymous: the file holds what the page shows, nothing that identifies the person behind a nickname.
Workplace talk also happens on Reddit: the Reddit Comments Scraper exports a full thread. Every site is on the review scraper hub.