I have no experience with football stickers, but my experience with Magic: the Gathering is that this sort of thing can absolutely get addictive.
But whichever thing it is, parental guidance is always a good idea. As a parent, you get a better idea of what's going on, and you can provide context for your kid and learn the lessons together. Maybe it was a scam after all, maybe it is addictive, maybe it's okay. But figure it out together.
Another thing to keep in mind: kids in France start drinking at a much younger age than elsewhere, but they do it at home, with half a glass of wine at dinner. The alcohol might still be harmful, but France certainly doesn't have the binge drinking problem that the UK has.
But whichever thing it is, parental guidance is always a good idea. As a parent, you get a better idea of what's going on, and you can provide context for your kid and learn the lessons together. Maybe it was a scam after all, maybe it is addictive, maybe it's okay. But figure it out together.
Another thing to keep in mind: kids in France start drinking at a much younger age than elsewhere, but they do it at home, with half a glass of wine at dinner. The alcohol might still be harmful, but France certainly doesn't have the binge drinking problem that the UK has.