When signing up for the forums cracked (fake) accounts CAN be used but UUID linking will be disabled unless you are manually assigned one. This will restrict features such as bans, votes, members, and staff modules being linked to your forums account but your Minecraft account will still be used (e.g. Ban lists will still show your Minecraft account but won't link to your forums).
Using cracked accounts is technically pirating which is a crime but Mojang said themselves, you may use cracked accounts but when you can afford a real one, buy one. Noles-Network will not punish cracked accountd but we highly recommend you purchase an official account when possible.