There's almost no risk, you can install it from the browser, the bootloader gets relocked so no issues with banking apps and rooted device, and you can still have play services on the phone but without it being able to access the whole storage and device info. You seem to literally just be spewing words without knowing anything about the subject.
If you don't want it I'd be willing to take it and experiment myself with graphene OS.
All modern phones come with a locked bootloader. This is to protect the OS and the User data, preventing anyone with physical access to the devixe from reseting the device and installing their own software without permissikn. I had to unlock mine on my 1+ 7P before installing /e/OS. It might just be that carrier locked phones might need something extra to unlock them not sure.