How do sites protect themselves?

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Hello everybody!
After studying the questions of interest to me about carding, new questions have appeared.
- How sites protect themselves from carders?

• What programs do sites use to protect themselves and how do they work?
• What data does the site collect about us and how to change it?
• How can a site understand that a person is the real owner of the card?
• How can a site understand that a person is a carder?
• Does email lifespan affect carding success?

Any topics that can help me on these issues, please send me.
Thank you all and have a nice day!