Twitter announced a few days ago that it planned to get rid of accounts that were inactive for over six months. But the social network is putting a pause to that plan until it can figure out how it can preserve accounts of people who've died. Twitter acknowledged that this oversight was "a miss on our part" and that it won't be removing any inactive accounts until they find a way to memorialize accounts. We assume the December 11 deadline Twitter set will be pushed back.
What was also not clear during the initial announcement was Twitter planned to start removing accounts in the EU, because of General Data Protection Regulation rules. But the company plans to bring it to other countries eventually. And when they do, this move will free up usernames of dormant accounts.
Source: The Verge