Does Launching a Competition Email My Subscribers?

No. Launching a Competition doesn't email anyone, so your subscribers only hear about it when you tell them. You've got two ways to do that:

• Your Gleam subscriber list: Open the Promote tab and click Email your Competition Subscribers via Gleam. Sending needs the Business Plan & above, and each email uses one credit
• Your own email list: If you sync entrants to Klaviyo, Mailchimp or another provider, send a campaign from there with your Competition link. Gleam adds people to your list, and what they receive after that is up to you

Promotion Emails skip anyone who's already entered, and every one carries an unsubscribe link. The full steps are in Email Your Competition Subscribers.