Apex domains cannot have CNAME records.
Question and response
Question
dig casinos.gov.do. NS
Answer
casinos.gov.do. 4 NS carmelo.ns.cloudflare.com.
casinos.gov.do. 4 NS tess.ns.cloudflare.com.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0