Assuming you mean mesh in general: Meshtastic like projects

- emergency communication

- low power data transfer for sensors

- low data rate data transfer for mobile groups. Air softers use it to transmit information to each other while playing.

HaLow:

- "high" data rate over shorter range, though much higher range than 2.4 wifi - data sharing between mobile groups like above, but high enough bandwidth for low quality video

- large area wifi deployments