Chain letters have been around for a very long time, i.e. from back in the days where people actually still used snail mail as the primary method of communication. They often feature some kind of wish or warning along with instructions on sending it forward to other people to ensure that your “wish” works.
Sadly, the digital age has only made chain letters worse because it’s now as simple as a click of a button to pass the letter on to everyone you know. One woman who got sick and tired of it sent the following email to her contacts in response. I’m just gonna copy+paste this to everyone I know.