Gist is a newer platform but the concept is not new. While not as polished as Intercom, Crisp, or Drift, Gist is also not nearly as expensive as all those other platforms.
When using Gist, there are many services that you no longer need to pay for, which easily justifies the cost. You no longer need an email marketing service, a live chat service, a scheduling service, and opt-in box service, facebook messenger bot service, or a helpdesk service. They are all consolidated into 1 affordable platform.
For me, it just makes sense to have 1 communication tool for all communication, live chat, email broadcasts, email marketing automation, etc.