It's an API that points to a hosted wallet service. So if you use the API, then you need to use the hosted wallet service. It's made for people who have coded their application to use rpc json to connect to bitcoind that then migrate to bitco.com. So, really bitco.com replaces bitcoind, not bitgod from an apples to apples perspective. Like the readme says, "For wallet-related API calls, BitGoD speaks on the back-end to the BitGo REST API, and allows the client to easily operate a multi-sig wallet as if it were dealing with a standard bitcoind instance."
https://github.com/BitGo/bitgodhttps://www.bitgo.com/You still need bitcoin-cli, so you'll need to install it. Depending on the 31 flavors of linux, your command may vary
yum install bitcoin-utils
dnf install bitcoin-utils
npm install -g bitcoin-cli