We're explicitly given top-down OKRs, which we're required to align our own "bottom-up" OKRs to, and then we're not empowered to meet our own OKRs, because product management alone steers the ship.
That's how I've often seen it implemented as well. There's absolutely no point to OKRs when used that way, I assume its a sign that someone pushed through a big change in the name of efficiency and got a nice promotion out of it without anyone checking to see if it actually helped.