Assembly AI is at $0.5 per hour, not extremely reasonable these days. With open source models like Facebook RASR or Vosk you can get self-hosted solution with even better accuracy and cost of $0.05 per hour, 10 times cheaper.
Once any of your customers come to require private video setup, you'll come to hosted solution anyway.
Once any of your customers come to require private video setup, you'll come to hosted solution anyway.