From a data management point of view, I have a similar question about a hypothetical sign that reads "Customer parking only"

- Am I a customer when I go into the shop?

- How about if I don't buy anything this time?

- When I receive a marketing email from the shop, based on my previous purchases, am I still a customer?

- How about 1 year later and I haven't bought anything, am I still a customer?

So when can I park there?

(obviously in the real world, there would be terms and conditions, but it's an interesting way to talk to clients about definitions in their data)