As I'm reading this, stingrays are pretty ineffective if users are using E2EE messaging (or just a VPN), and can then pretty much only be used for location estimation.
I usually just borrow e-books from the library, download as epub and strip the DRM from the file so I can read it, and return the eBook to the library right away for the next person to borrow it.
You just linked the same video as OP