AdGuard names 6,000+ web trackers that use CNAME [cloaking]
AdGuard on Thursday published a list of more than 6,000 CNAME-based trackers so they can be incorporated into content-blocking filters.
Not important. See https://github.com/nextdns/metadata/issues/601#issuecomment-791563171
This is already handled by https://github.com/nextdns/cname-cloaking-blocklist, and appears as a specific and separate feature in NextDNS.
The reason they advertise the 6000+ is that I'm assuming their system is not able to block at the CNAME level, so they do something less ideal of scraping the web to try to list all QNAMEs pointing to those few CNAMEs, and try to keep this list as complete and up-to-date as they can.