Personal opinion, I'm not sure this matters too much. This is using your own session cookie to access Bard, and it will be rate limited to whatever rate limit Google apply to individuals using Bard, which will likely be insufficient to run a business off.

If you want to get a better API, more model access, and higher quotas, you can pay for access via Google Cloud.

Disclaimer, I work for Google, not on this, and this is all just my personal opinion not based on any insider info.