Huh? Banking apps not working on GOS are a rather rare exception (which I have not run into ever and I use several), and streaming apps work just fine. I "only" use Netflix & Amazon Prime but other people attest[0] to Disney+, Paramount, Max, and SkyGo working, too – even without Google services.
[0]: https://discuss.grapheneos.org/d/20256-streaming-apps/6