the Drive survey is probably unrelated :)
Now that you've filled out the form once, you're in our database, so you don't have to fill it out again! We're doing user studies all the time, but I'm not sure how often we do them in Italy, unfortunately. For any given study, we'll email a bunch of potential participants from the database and then pick ones who respond and are a good fit (sometimes we have specific needs for people who use or don't use certain Google products, depending on what we're testing). If someone participates in a study, we probably won't contact them again for awhile (we like to get a variety of participants), but if someone isn't selected to participate, we still might pull them from the database again a few months later, just depending on how many people we have in our database at that time.