I’ve fallen for it a few times when I was younger, but nowadays I just refuse all free stuff. Not all things are so malicious, but I can’t be bothered to be on my guard all the time. Like I often get offered free stuff at the train station. It’s usually just some unmotivated student who’s standing there because they’re getting paid. I’m sure it’s actually just a plain, free sample,but I can’t be arsed anymore.