This is incredible software with a small caveat: some apps can't be mirrored -- the ones which show blank on the task switcher view. This is more of an OS limitation than scrcpy's fault.
I assume in the case of apps trying to protect copyrighted content, the answer is likely "yes but the app might check its own signature and exit if it's not valid, which it won't be at that point, so you'd also need to rip that out, which makes the job way harder."