There is significant subtlety involved in realizing that if you bought a motorcycle jacket you are very unlikely to need a second one, especially a very similar one, until it falls apart, while if you bought apples you are likely to eat more apples soon.
Similarly, Booking.com recommends hotel room offers in foreign cities where I've been on vacation: it doesn't have any tourism detection and analysis, it just thinks that I'm indiscriminately likely to return to the same places without realizing I visit one or a few major cities in a different country every year and then the museums and monuments are going to stay the same for a while. To be fair, they'd need data about my habits they (fortunately) cannot see to do a good job.
Similarly, Booking.com recommends hotel room offers in foreign cities where I've been on vacation: it doesn't have any tourism detection and analysis, it just thinks that I'm indiscriminately likely to return to the same places without realizing I visit one or a few major cities in a different country every year and then the museums and monuments are going to stay the same for a while. To be fair, they'd need data about my habits they (fortunately) cannot see to do a good job.