Re: WTF?
> Is it a keyed start,
Asking the wrong question.
You want to know if it's a keyed start *and* if the keys are actually unique...
A decade old, but, it used to be an issue: https://www.bbc.co.uk/blogs/daveharvey/2010/05/one_key_fits_all_tractor_polic.html
In 2003, JCB were (one of?) the first in the industry to announce they'd be using unique keys, rather than a one-key-for-all.
I don't know about their dozers, but in 2019, Caterpillar were still selling common keyed padlocks. Amazon has this: https://www.amazon.co.uk/Replacement-SP8500-Key-Caterpillar-Excavators/dp/B0051OF2Y4 which suggests that there's some recent kit that uses a common key