I've never worked anywhere that OKRs are actually taken seriously or followed through.

They'll get rolled out with a big hype, people will fill them out with varying degrees of diligence and understanding of how OKRs are supposed to work.

3 months later they're already forgotten and out of date. Some managers will try to keep it going for their teams, because that's what they were told to do, but that'll peter out once they realise no-one else in the org is taking it seriously.

6 - 12 months later there'll be a half-hearted attempt to reset and resurrect the OKR process, but after the first time people take it even less seriously the second time around, and after a few more months OKRs are never mentioned again.