Apex domains cannot have CNAME records.
Question and response
Question
dig freeyourads.com. NS
Answer
freeyourads.com. 5 NS ns-234.awsdns-29.com.
freeyourads.com. 5 NS ns-312.awsdns-39.com.
freeyourads.com. 5 NS ns-309.awsdns-38.com.
freeyourads.com. 5 NS ns-1069.awsdns-05.org.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0