Obamas, HRC, Soros, others, Twitter pages switch to black and white profile or header image. Is this a comm?

Examples:

https://mobile.twitter.com/georgesoros

https://mobile.twitter.com/hillaryclinton

https://mobile.twitter.com/michelleobama

https://mobile.twitter.com/barackobama

https://mobile.twitter.com/oprah

https://mobile.twitter.com/gavinnewsom

https://mobile.twitter.com/drbiden

https://mobile.twitter.com/chrissyteigen

https://mobile.twitter.com/heidiklum

https://mobile.twitter.com/heidinbc

https://mobile.twitter.com/elijahwood