So that shady servers can take away your card, copy the numbers including the 3 digit extra "security" code and then use it to buy things online with it. At le

So that shady servers can take away your card, copy the numbers including the 3 digit extra "security" code and then use it to buy things online with it. At least if restaurants had those portable scanner machine like they do in other countries, but they don't here in US usually.