From their git closed tickets:
NSA: https://github.com/nextdns/blocklists/pull/105
Google and Facebook:
https://github.com/nextdns/blocklists/issues/235
From the git activity (diff linked in case anyone wants to copy and paste):
Google and Facebook: https://github.com/nextdns/blocklists/compare/8e36cfa267930a7dba8e27b0501e199c8a02b0b3...439d8b5a053aab0f93a7ad4341798ebfd1f17a0b