Alert! Twitter will start Deleting Inactive accounts starting December

Twitter will begin deleting all accounts inactive accounts for more than six months starting December 11, sends warning email

Twitter is reportedly planning to remove inactive accounts to free usernames from its portal. 
As reported by The Verge, The social media giant has started sending warning emails to the users. According to the report, if a user is not active for more than six months, their accounts will be removed in accordance with its inactive account policy to free usernames from the portal.
Users will receive an email requesting them to log in to their twitter account and follow the instructions on the screen. Just logging in will serve, so you don't have to Tweet anything. Twitter states that they're doing this to "present more accurate, credible information" that people can rely on. Besides, Twitter could use a good clarification.
By Twitter's Spokesperson, there is no exact date as to when these usernames will be made available for others to grab. The company has stated that the account removal process 

“will happen over many months – not just on a single day.” We have begun proactive outreach to many accounts who have not logged into Twitter in over six months to inform them that their accounts may be permanently removed due to prolonged inactivity,” appended Twitter spokesperson.

 Earlier this month, Twitter bans all the political ads on their platform. Today, Started today Twitter Officially announces that it will start deleting inactive accounts starting December 11th. It is exploring ways to give users more control over retweets and mentions. These features are being explored for 2020. Allowing people to disable retweet on a tweet and mentions can prove to be a powerful anti-harassment tool when implemented, said the company.