if you put something on the internet, assume that everyone will see it and know it's you. It's as simple as that. So if I submit my credit card information

if you put something on the internet, assume that everyone will see it and know it's you. It's as simple as that. So if I submit my credit card information to Amazon, which is part of the Internet, I should assume that everyone will see my credit card information? It's as simple as that? That's good to know. Thanks for your help.