A public channel is a good fit when organic growth and easy sharing matter. It can be found through search, recommendations, similar channels, and a short t.me/username link.
The downsides of a public channel:
- some people read it without subscribing;
- Telegram Ads may show in the channel;
- recommendations can pull attention toward other channels.
A private channel is a good fit when control over access matters more. A user can't see the content before joining, and the owner can work through invite links and join requests. This is useful for a closed community, paid or restricted content, test launches, and campaigns where it's important to turn a click into a subscription.
Join requests help filter out random users and bots, control access, and create a sense of a closed space. This approach makes sense if the content really lives up to the wait.
Sometimes a channel is temporarily switched to private mode during an external ad campaign, so that clicks turn into joins more often. After the campaign, the channel can go back to public mode for organic growth. This isn't suitable for Telegram Ads, but it can work for direct placements, external promos, or bot mailings.
When you temporarily switch a public channel to private mode, preserve the short username through a separate public buffer channel. In it, you can pin a link to the main private channel so the old short link keeps leading the audience to the right place.
