That's an idea, but isn't what something like Glassdoor is supposed to be? They are mostly known for reviews once on the job, but I believe they have a section

That's an idea, but isn't what something like Glassdoor is supposed to be? They are mostly known for reviews once on the job, but I believe they have a section about the interview process. I personally keep a record of a blacklist of companies that don't behave well. It's sourced either from personal experience or friends/co-workers/etc. When they reach out to me I have no problem telling them that their reputation is not good and that I'm not interested in talking to them.