[gregjor]

You didn’t sign up for an Amazon machine learning webinar. You signed up to contribute to a lead generation campaign that incidentally included a webinar about machine learning. The main purpose of free webinars and trade shows and so on is lead generation, either to identify possible customers, or possible job candidates, or both.

If you don’t want to get on a mailing list or in a recruiter’s database use a throwaway email address. No one at Amazon or whomever they outsource their lead databases to is looking to see if your email is a work address or not. You’re the product, not the customer.