This is an interesting development:

Just days after President Biden demanded that President Vladimir V. Putin of Russia shut down ransomware groups attacking American targets, the most aggressive of the groups suddenly went off-line early Tuesday.

[…]

Gone was the publicly available “happy blog” the group maintained, listing some of its victims and the group’s earnings from its digital extortion schemes. Internet security groups said the custom-made sites ­- think of them as virtual conference rooms — where victims negotiated with REvil over how much ransom they would pay to get their data unlocked also disappeared. So did the infrastructure for making payments.

Okay. So either the US took them down, Russia took them down, or they took themselves down.