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There can be endless ways to spy on android devices or phones in general. Device intrusion is one way to get in and it may not be always effective because of hardened OS protections and malware detection. Spying in general depends upon possible attack vectors that can be used to discover your secrets. E.g. Your wifi traffic, internet activity, online ...
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I assume that by saying "spy apps" you are talking about a specific type of paid apps.
Well even those non-paid apps or even self-developed ones can spy on your phone due to the fact that your phone is generally not protected by Anti-virus solutions, so any amateur can create a remote access trojan (RAT) and spy on you.
Now, how can someone install ...
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To answer from the security standpoint, and according to the linked answer from SO, the real risk is that a root user can actually exfiltrate the JWT.
Android is hardened enough to that processes do not interfere each other. But if the user running the device has root capabilities, and given that your application can't detect root for sure, there is the ...
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