How They Claim to Work:
They typically automate the WhatsApp Web interface or use unofficial APIs to send messages from a regular WhatsApp account.
Common Features They Advertise:
Bulk messaging to any list of numbers.
Filtering active WhatsApp numbers from a list.
Group member extraction.
Google Maps data extraction (to generate number lists).
Message delay management (to avoid immediate detection).
"Anti-blocking technology."
Examples (Often found on whatsapp number list local marketplaces like Daraz.com.bd or obscure websites):
"WA Sender," "WhatsApp Marketing Software," "WhatsApp Contacts Filter" (specific names vary, but the functionality often hints at unauthorized use).
Account Banning (High Risk): This is the most significant consequence. WhatsApp has advanced anti-spam measures. Using these tools violates their Terms of Service and will almost certainly lead to your WhatsApp number being permanently banned, losing all your business contacts and history.
Legal Action: WhatsApp/Meta has explicitly stated they may take legal action against individuals or organizations misusing their platform with unauthorized tools.
No Guarantees: No guarantee of message delivery, and features often break with WhatsApp updates.
Data Security Risks: These tools often require you to link your WhatsApp account (e.g., via QR code scan), giving them access to your data, which is a major security and privacy risk.