Can user B receive data of the multicast service ordered by user A on an S series switch

After a Layer 2 device such as a switch receives multicast packets and IGMP snooping is not enabled in a VLAN, multicast packets are broadcast in the VLAN. This is because the MAC address entry corresponding to the multicast address cannot be learned in the VLAN and packets are processed as unknown ones.
When a Layer 2 device is connected to user A and user B in the same VLAN and IGMP snooping is not enabled in the VLAN, user B can receive data from the multicast source that user A orders. However, user B usually discards received multicast data packets because the corresponding multicast client software is not enabled.

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