Why is DigitalOcean trying to withdraw money on signup?

Question

DigitalOcean

Hi all. Register on DigitalOcean using the referral link to get $10. I enter the card details and he tried to withdraw $ 9 from my card, I thought there must have been some kind of mistake, reloaded the page and re-entered the card details and then he tried to withdraw $ 12. As I know, usually other sites, in order to check the card, withdraw $ 1 and immediately return it.

Answer 1

patamushta defense and offense are always competing
and do not always read the rules