whatsapp could simply limit number of forwards per day to 20-50 per number (account).
Similarly make rules like you can send msgs to x number of unique numbers, it won't be very hard to identify spammers sending bulk msgs.
Ratio of messages sent to received.
number of msgs sent to unknown numbers (not in contact) etc
Similarly make rules like you can send msgs to x number of unique numbers, it won't be very hard to identify spammers sending bulk msgs.
Ratio of messages sent to received.
number of msgs sent to unknown numbers (not in contact) etc
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