Looking at NS records today some of yesterdays affected companies decided to change things after the DoS on Dyn. As the NS record is not really a customer facing feature this is more an indication of Dyn's customers expectations. One could argue switching away from Dyn could mean fear of more downtimes to come. Here is a summary of changed NS records so far:
I did only check some NS records for changes, just several of the top sites.
There are two note-worthy non-changers being Twitter and Github though, everyone
else seems to have mitigated. Some to using two providers, several switching to
AWS DNS or UltraDNS exclusively.
|Site||Before (15.10.)||After (22.10.)|