Although we don't have a hard limit on the maximum number of user you can have in a channel, we do have a general guideline depending on the two different channel types we offer:
1. Public Chat (using Open Channels): We recommend around 2,000 users max. per channel. Typically, the conversation becomes difficulty to follow once you reach beyond this point.
For live-video streaming: We support 50,000+ concurrent viewers per channel with smart throttling/auto-partitionaing. Please reach out to us at firstname.lastname@example.org
2. Private Chat (using Group Channels): We recommend a max. of 250 to 300 users per channel, since the read-receipts and typing indicators becomes more of a noise for private chats once the users go beyond this number. It is ideal to keep it in the low two-digits range for an optimal chat experience.
Hope this helps! :)