Apex domains cannot have CNAME records.
Question and response
Question
dig bitbrains.net. NS
Answer
bitbrains.net. 2 NS a3-64.akam.net.
bitbrains.net. 2 NS a26-64.akam.net.
bitbrains.net. 2 NS a1-167.akam.net.
bitbrains.net. 2 NS a10-67.akam.net.
bitbrains.net. 2 NS a12-65.akam.net.
bitbrains.net. 2 NS a5-67.akam.net.
Authority
The response has no authority records.
Additional
a3-64.akam.net. 4 A 96.7.49.64
a5-67.akam.net. 4 A 95.100.168.67
a1-167.akam.net. 4 A 193.108.91.167
a10-67.akam.net. 4 A 96.7.50.67
a12-65.akam.net. 4 A 184.26.160.65
a26-64.akam.net. 4 A 23.74.25.64
a3-64.akam.net. 4 AAAA 2600:1408:1c:0:0:0:0:40
a5-67.akam.net. 4 AAAA 2600:1480:b000:0:0:0:0:43
a1-167.akam.net. 4 AAAA 2600:1401:2:0:0:0:0:a7
a10-67.akam.net. 4 AAAA 2600:1480:d000:0:0:0:0:43
a12-65.akam.net. 4 AAAA 2600:1480:f000:0:0:0:0:41
a26-64.akam.net. 4 AAAA 2600:1480:b800:0:0:0:0:40
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0