Apex domains cannot have CNAME records.
Question and response
Question
dig arthurgangstersh.com. NS
Answer
arthurgangstersh.com. 4 NS ns-108.awsdns-13.com.
arthurgangstersh.com. 4 NS ns-1712.awsdns-22.co.uk.
arthurgangstersh.com. 4 NS ns-795.awsdns-35.net.
arthurgangstersh.com. 4 NS ns-365.awsdns-45.com.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0