Why do merchants double 1 1 promote marketing by sending short messages?

The main reason is that SMS group sending has the advantages of direct SMS, wide audience, compulsory reading and low price, which is favored by merchants and is an essential weapon to obtain customer traffic during the Double Eleven period. However, the promotion of dual 1 1 SMS is also a double-edged sword, which will bring traffic and be complained by some uninterested customers.