They know you clicked on a page that is for a given (set of?) product(s). They know you stayed on that page for longer than a moment, then scrolled down. They

They know you clicked on a page that is for a given (set of?) product(s). They know you stayed on that page for longer than a moment, then scrolled down. They may also have data that >90% of customers who make a purchase choose/click in <10 seconds, and never scroll. Or may even take a different path entirely or similar. They could interpret all of that as you inspected the product(s) on the page, didn't choose/click one, and _now_ is the best time to prompt you with suggestions to maintain engagement in >75% of instances. You could also be one of the lucky few customers in a sacrificial control group unknowingly testing their new shitty popup to measure its impact on sales. Whilst I can't say for certain that any of this is your case, I absolutely guarantee there are many retail sites that do this - I've worked at several now - and this is bread-and-butter material to data teams working with customer engagement.