not CFAA concerns, but you'd probably be in violation of the WhatsApp TOS: "… (d) interfere with or disrupt the safety, security, confidentiality, integrity, availability, or performance of our Services; …"
Yes, in the own project there is a disclaimer that using this software might get your WhatsApp account banned so use with caution, and anyways is just a fun project for educational purposes. But good to know ofc