Probably because the individual engineers working on Takeout care about doing a good job, even though the higher-ups would prefer something half-assed. I work for a major tech company and I’ve been in that same situation before, e.g. when I was working on GDPR compliance. I read the GDPR and tried hard to comply with the spirit of the law, but it was abundantly clear everyone above me hadn’t read it and only cared about doing the bare minimum.
If it’s a publicly-accessible repo, then immediately revoke the key and leave it. Force-pushing isn’t good enough because the old commit will still be tracked by Git until the garbage collector kicks in, and you don’t have control over the GC on GitHub (not sure about other providers).
If it’s an internal repo that’s only accessible by employees, then you probably should still revoke it, but you’ve got more leeway. Usually I’d create a ticket to revoke it when there’s time, unless this is particularly sensitive.