Yeah, so I don't see a lot of people using the Channel or Communities part of WhatApps. I am in a few, but they are all muted and/or archived. I never read those messages.
I see a lot of people in large groups, but they never read those messages, even when they ring their notifications all the time. My mother used to delete dozens of group notifications when unlocking the phone to search for the ones from her friends. It's really bad.
I understand about group notifications being annoying, but these groups seem very popular for food & clothes. I am not sure what the success rate is for these businesses, though WhatsApp is trying hard integrating payments via UPI also in India.
But is it popular for users or for businesses? I think business like them but users hate them.
Possibly... But I don't think it's too bad for users (In India, businesses are anyways not known for customer-friendliness, so I suppose it's within tolerable limits).
Chiming in to say this reflects my long-term experience using Discord as well. It's a decently designed application as far as channel management is concerned, but otherwise it becomes a graveyard of mildly relevant interests and communities. Even after purging my server list, I keep all but one server permanently muted with all notifications disabled except for private DMs.