Sec Pompeo was tweeting normally at irregular time, and typically issue 2-3 tweets per day up until Dec 31, 2020.
This is the last 'normal' tweet from Pompeo: https://twitter.com/SecPompeo/status/1344870794120339457

Starting from Jan 1, Pompeo has been tweeting every 30 mins or 1 hour on the dot. Tweeting starts at 8am Eastern every morning sharp. https://twitter.com/SecPompeo/status/1344991807118176257

Go check it out yourself: https://twitter.com/SecPompeo

What is the theory behind this?