Grandparents: Do you buy things for your grandchildren only for your own home?

What I mean is, do you buy your grandchildren gifts that they aren’t allowed to take home? Not certain or special items, but any items that you buy must stay at your house?

I’m curious, because my MIL buys gifts for the kids, but they aren’t allowed to leave her house. Clothes, toys, games, everything she buys for them has to stay there. I’m just wondering how common this is, because I don’t remember my grandparents ever doing this (unless it was something special or a particular item that made sense to keep at their house) and my parents don’t do this with any of their grandchildren, so the concept confuses me.