Apex domains cannot have CNAME records.
Question and response
Question
dig etaika.fi. NS
Answer
etaika.fi. 5 NS ns-1142.awsdns-14.org.
etaika.fi. 5 NS ns-259.awsdns-32.com.
etaika.fi. 5 NS ns-764.awsdns-31.net.
etaika.fi. 5 NS ns-1610.awsdns-09.co.uk.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0