Apex domains cannot have CNAME records.
Question and response
Question
dig freedominter.net. NS
Answer
freedominter.net. 5 NS authdns1.freedomnet.nl.
freedominter.net. 5 NS authdns3.freedominternet.nl.
freedominter.net. 5 NS authdns2.freedominter.net.
Authority
The response has no authority records.
Additional
authdns2.freedominter.net. 5 A 185.232.98.20
authdns2.freedominter.net. 5 AAAA 2a10:3780:2:53:185:232:98:20
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0