Those 101 chosen nodes can be completely reconfigured by the fully decentralized participating owners in 10 seconds.
This.
A common question I get is, "if everyone is running on AWS or Digital Ocean won't they be targets to shutdown from regulators?"
The answer is as Stan says above. Having a configured delegate setup and ready to go on a laptop from your home can be turned on in seconds while searching for a new VPS. The powers that be may play wack-a-mole for a while and then give up.
10 seconds is not very realistic now IMO. How many of the 101 have a redundant hosting service that is on a totally different segment of the Internet? If the BitShares blockchain network has centralized too greatly on hosting providers like digital ocean aws or whoever, it is a weakness in decentralization.
Granted not a catastrophic weakness, but significant enough to disrupt the flow of transaction until redundant block producers can come online to take their place. The good news is that even if all 101 delegate nodes are "nuked", the blockchain lives on in millions of nodes and the network will resume as soon as new delegate nodes take over.
It does stimulate thoughts tho about possible attack scenarios in a window of time should all delegate nodes be taken out and failure of automatic redundant nodes to come online. I'm not sure how much automation is built into the kicking in of redundant delegate nodes or the degree of redundancy in general. 101 is not a big number. It doesn't seem inconceivable for the U.S. military to simultaneously target 101 locations as well as shutting down major segments of the Internet in a coordinated attack.