You don't even need to be a founder, just a person in a position that people may believe is responsible for buying products and signing checks at a company.
With marginal cost of spam being $0, I am pretty sure homeless people and Bill Gates get exactly the same amount of spam. I’d be surprised if there was any target selection.
LinkedIn scraping is rampant.
It really is. I don't have my phone number on there, obviously, but when I went from being a random code monkey to having a 'Director' title at a very large institution, my sales spam went from 0 to probably 50 pieces a day.