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Selenium grid runs in docker, so it's easy to have multiple instances running. Better control.

Also, if use Kubernetes to manage the grid you can scale out to your credit card limit on GKE: https://github.com/kubernetes/kubernetes/tree/master/example...

What are the advantages of this versus a thread pool of web drivers? I'm not really familiar with Selenium Grid.

Grid can dynamically dispatch based on the browser and capabilities you want when you create the session.