In March 2021, someone asked a question about carbon emissions of their data centres. They said they hosted on both GCP and AWS, but mentioned they were interested in moving to their own bare metal [1].
In April 2021, I asked a question about egress fees to Google, and they walked back a bit the comment about moving to bare metal [2].
As of March 2022, they're still in AWS/GCP [3].
As of September 2022, workloads for new users deploy into AWS, even in regions that were previously served by GCP [4].
[1]: https://community.render.com/t/does-render-use-green-energy/...
[2]: https://community.render.com/t/is-render-com-hosted-in-googl...
[3]: https://community.render.com/t/are-your-servers-owned-by-you...
[4]: https://community.render.com/t/which-render-regions-map-to-w...