Did you read the article? It explains a very thorough opt-in process which involves mailing a signed letter on company letterhead and manual reviewal.
What I meant was that the possibility to access private chats should stay not retroactive and only happen once the company has explicitly stated it will need this feature enabled.
EDIT: so that if my company has no legal needs today it won't have access to private chats made today once they decide in the future that they now need the feature