What is considered an incoming message & event? An incoming message & event is any action that triggers bot activation. Only incoming messages & events that a bot listens to count towards the quota. The following actions count as an incoming message & event: • A user saying "Hello" to a bot • A reaction being added to a message • A proactive trigger that opens the bot • A session timeout event • Opening the Shareable URL • Publishing your bot (counts as 3 events) The following actions don't count as an incoming message & event: ‍ • A message sent by the bot in response to a user message • An execute code card • Flow transitions

so the answer would be yes, it is counted as billable.