I remember Sprint merged with T-Mobile awhile ago so I don't see reason why oem unlock is grayed out for you
On my moto G7 with T-Mobile I managed to unlock bootloader with no issues at all so if oem unlock was available for me I don't see the reason why it's not available for you
Turns out, I had just activated the phone and it takes a week or so for the activation data to register with local cell providers. It took about three, maybe four days but the option for oem locking went from grayed out to available. Using the official Motorola bootloader unlock page I was able to unlock it with ADB/Fastboot on PC.
I am also looking into a way to root this phone. I have read through the forums, and this one included, and concluded, I do not have a PC. However, If there is a remote root service I could pay for or a senior member who would take a donation in exchange for root access on the Moto G Power 2021 Boost Mobile sprint USA Variant, I'd be ecstatic.