Gaming Disorder has been added to the World Heath Organisation's classification of diseases; note this is a 'disorder', not an addiction. The clinical conditions say that: 'Gaming disorder is characterised by a pattern of persistent or recurrent gaming behaviour..." manifested by:
 "impaired control over gaming"
 "increasing priority given to gaming to the extent that gaming takes precedence
over other life interests and daily activities"
 "continuation or escalation of gaming despite the occurrence of negative
consequences."
Freelance games expert, Andy Robertson, has written an article on the internetmatters.org website that explains 'What you need to know about WHO gaming disorder'. You can read the article here