You're now confident that the other 399+ domains you mentioned are not under any sort of duress because they're controlled by people who are away of what's happening?
I feel confident that no system exposed to the internet should have a problem with 50,000 requests per month! If they do, they probably shouldn't run a public NTP server, or have a public IP address at all.
I feel confident that no system exposed to the internet should have a problem with 50,000 requests per month! If they do, they probably shouldn't run a public NTP server, or have a public IP address at all.