There are two reasons:
It's not true 18 years old. Restrictions refer to minors under the age of 18, depending on whether 18 has passed its birthday. Only after your birthday do you belong to a real adult. There is a misunderstanding about the definition of 18-year-old adults.
18 birthday has passed, but the system is still limited. You can go to the manual customer service to lift the underage anti-addiction restrictions.
The time limit rules of the national service of the peace elite explain that the national service of the game peace elite has an anti-addiction time limit for minors. You can only play for two hours a day!