https://arstechnica.com/tech-policy/2023/05/twitter-starts-purging-inactive-accounts-after-quiet-policy-change/

On Monday, Twitter CEO Elon Musk tweeted a warning that all inactive Twitter accounts would soon be purged, potentially impacting follower counts.

"We’re purging accounts that have had no activity at all for several years, so you will probably see follower count drop," Musk tweeted.