Some fake keygens encrypt your personal files (documents, photos, save games) and demand a payment (usually in Bitcoin) to unlock them. Since you obtained the keygen from an illegal source, you have no recourse.
Key patterns are encrypted. A random generator cannot guess a valid, unactivated code any more than someone could guess your specific credit card number and CVV. The Risks of Using Key Generators key generator for 600 ea games
EA offers several high-quality titles that do not require a purchase or a key generator: EA Play Membership - Official EA Site EA Play is just $5.99 a month or $39.99 for a full year. Electronic Arts Home Page Some fake keygens encrypt your personal files (documents,