Either I'm already certain or it's necessity/desperation.

If I'm actively looking for an certain type of application I will usually dedicate half a day to sign up for bunch of different apps all at once. It's pretty time consuming and I'm usually left disappointed. I will then spend the next half a day trying to remove myself from them all.

Then 6 months later one of those app companies send you an email update, by which point you've forgotten what they do, and yet they give you no hint of what the app is in said email.

Or year later they got bought by some other company and your account is transitioned to the new company but those emails automatically got sent to spam and now all of a sudden you’re a customer of a new company and you had no idea. It’s happened to me more than once.

Or they email you 3x a day for something you were interested in for no more than 10 minutes.