How do service delivery services work?

Question

Programming

Good day to all!
I'll actually start with an example.
I bought tickets, for example, to Greece and booked a hotel there 8 months before the departure date. In 2-3 weeks, I receive a letter in the mail with an offer to rent a car in Greece from some well-known company.
Question - how did the car rental company know that I was going to be in Greece? Also how did they get my email? At the same time, for example, I indicated my mail only on the Aeroflot website when I ordered tickets. Is it just a leak of information or something else?

Answer 1

Did you book the hotel apparently in some booking? Here is your answer. Related services hang out there. It is unlikely that this is a drain, most likely these guys work quite officially there as service providers.