The fact that the account has been registered can only prove that the user has used LINE before, but it does not prove that the user is still active recently. As number data continues to accumulate, long-term unused accounts will gradually reduce the actual value of the entire customer pool.
Registration status cannot reflect whether the user is still using LINE recently
The old and new numbers are mixed together, making it impossible for operators to determine the order of follow-up.
Silent accounts occupy the customer pool, resulting in a mismatch between sending volume and effective feedback.
Users with different levels of activity use the same operating strategy, and resource allocation is unreasonable
Customer information has not been updated for a long time, and the historical valid list gradually loses its reference value.
