Short, because there is not much to say.
Use it freely, for anything, including commercially. There is no account, no licence to accept and nothing to agree to. The API is open too; please be reasonable with it so it stays that way for everyone.
Scripture text is public domain. The scholarly data is CC BY 4.0, and a small partition is CC BY-SA 4.0. Those licences travel with the data: if you reuse it, the credits on the attribution page come with you. Nothing here overrides the terms of the upstream sources.
This is provided as-is, with no guarantee of accuracy, completeness or availability. The data is generated mechanically from third-party sources and has not been reviewed by a person — do not rely on it where being wrong would matter, and check Scripture itself.
Gifts are voluntary, buy nothing, and are not refundable. They are made to an individual and are not tax-deductible. See /support for where the money goes.