A: Cfx.re bans for cheating in-game, not for offline file editing. However, if you inject a decrypted MLO back into a server that checks file hashes, you will be banned from that server.
A: No. These are scams containing malware. There is no one-click solution because every obfuscator is unique. decrypt fivem mlo
A: Most decryption tools (memory editors) require Windows. You will need a virtual machine. A: Cfx