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Would be neat to launch a SaaS service with it that let people test their apps on various real phones.

Or have "real world device" testing in your CI/CD pipeline.

Or to automate something else that's only available via an android app.

PS: I work for Browserstack

These exist.

And Geny's: https://www.genymotion.com/cloud/ (albeit a bit different)

Note that Genymobile/Genymotion is the company which open sources scrcpy ;-)

I know, which is why I couldn't forget it :-)