

There’s an old adage that I’ve heard multiple civil engineers tell me.
There are only two kinds of concrete. Concrete that has cracked, and concrete that is about to crack.
Your slabs having zero cracks until now is more impressive than it getting cracked NGL.
As long as the slab does not begin to separate (different pieces sink and leave ledges) its probably not worth pursuing. I’d throw sealant over the top to keep it from flaking and call it.
Charging brick. Or, if an unmarked generic brand like the ones you’ve shown, Fire Hazard.