China has been doing this for years.
This is how firewalls work, and is much lower level than DNS blocking.
JUST RELEASED: Emergency Directive 21-01 calls on all federal civilian agencies to review their networks for indicators of compromise and disconnect or power down SolarWinds Orion products immediately. Read more: https://t.co/VFZ81W2Ow7
— Cybersecurity and Infrastructure Security Agency (@CISAgov) December 14, 2020
If everyone was holding bitcoin on the old x86 in their parents basement, we would be finding a price bottom. The problem is the risk is all pooled at a few brokerages and a network of rotten exchanges with counter party risk that makes AIG circa 2008 look like a good credit.
— Greg Wester (@gwestr) November 25, 2018