Hey thanks for looking into Cerbos. It can be deployed a number of ways - essentially anywhere that can run a container or a binary. This isn’t possible with Netlify which is more built for serving static assets (with some lightweight functions in JS).
The lightest way to get started without running any infrastructure is to look at deploying a Lambda function and calling that from your Netlify functions - you can find details
here.
That said, we are looking at how Cerbos can be part of the ecosystem of Netlify and Vercel type services and will definitely let you know if support changes.