I'm trying to figure out how you want this to work.
If your own laptop is stolen, you're no longer in physical possession of it.
So from the perspective of the laptop, some sort of interaction should brick it. What should that interaction be? It needs to happen early, before thieves have a chance to disable it. So it needs to happen before login, say. Really it needs to happen at either bootup or as soon as the laptop establishes a connection to the internet.
At which point it should... reach out to you? How? Must you own a second Apple device for that to work? Okay, let's go with that. You have an iPhone, and you use Find My to brick the laptop. So now someone can steal your phone and use it to brick your laptop? Your laptop needs to talk to your phone every time it boots up or connects to the internet?
I'm not sure you've thought this through.
It seems reasonable to me that the only entity that makes sense here is Apple. Even a savvy thief, who might block packets to anywhere unexpected--and "person's iPhone somewhere" is definitely unexpected--is going to need to let packets go to Apple, making them the only party with the means and opportunity to do this.