Meta can limit or pause a number if its quality rating falls (many blocks or reports), if a template is misused, or if the business breaks WhatsApp's commerce rules. It is rare for a business that messages only people who asked to hear from it.
What you will see
The assistant stops sending templates and alerts you. Replies to customers who message first usually keep working.
What we do
Pause campaigns, find the cause in Meta's notices, fix the template or the audience, and submit the appeal. Most restrictions lift within days once the cause is fixed.
How to avoid it
Never send offers to people who did not opt in, keep campaigns to a few a month, and honour every STOP. The assistant enforces all three for you.