I run a domain for our community association. I had an “ethical hacker” discover that I had neglected to set up spf records for that domain. I had to deal with him sending a bunch of nasty emails to our other board members after I refused to pay him for his “discovery”. (Actually I offered him a cut of my salary as a board member, which at $0, came out to be… less than he was hoping for)
I’ll definitely keep a link to this for next time this happens.