Facebook-owned WhatsApp is removing at least two million accounts each month for bulk or automated behaviour and over 75 per cent of those without recent user reports.
"While there are many actors trying to abuse the free service we provide, we are constantly advancing our anti-abuse operations to keep the platform safe," WhatsApp said in a statement on Thursday.
WhatsApp is banning accounts that send a high volume of messages.
"We're able to detect and ban many accounts before they register a" preventing them from sending a single message. Roughly 20 per cent of account bans happened at registration time," the company informed.
WhatsApp, which has over 200 million users, aims to understand the behavioural cues indicating bulk registrations.
"For example, our systems can detect if a similar phone number has been recently abused or if the computer network used for registration has been associated with suspicious behaviour," it said.