If possible could you tell us what the "high volume of people who enable images" is exactly? Is it 50%, 75%? I am curious because part of my startup-in-progre

If possible could you tell us what the "high volume of people who enable images" is exactly? Is it 50%, 75%? I am curious because part of my startup-in-progress will eventually include tracking of email notification reading using images, or other tricks.