I am sick of companies that abuse consent. For example, one online retailer - from whom I have only ever made one purchase, which was returned, due to poor quality - regularly sends 3-8 emails a month.

Further, their unsubscribe form actually resulted in another spam message.

It's almost a guarantee that when you buy a single item from a retailer, ensuring you uncheck/check properly all the boxes, you will be bombarded with promotional marketing emails from them forever.