There are very legitimate reasons to incorporate in another location. Some are not only not sketchy, but even altruistic, e.g. incorporating in another state for the purpose of incorporating as a PBC.
Did they incorporate as a PBC?
Is there actual case law of people using a company's status as a PBC to effectively hold it to account for detrimental corporate conduct?
Businesses choose Delaware because their corporate law and court system are are both well developed and streamlined which makes investors comfortable.
There are plenty of other states that are better choices for tax reasons.
And what of incorporating somewhere, having your headquaters somewhere else, having your main office in a third place, and this all owned by a shell company in a fourth place, with all your assets owned by a fifth company, which rents it back to you for extortionate rates, your EU subsidiary in a sixth place, the actual EU offices in a seventh place, etc etc etc.
Thats not even approaching the trickery and deceit that is accepted as completely normal - let alone the ones that actually get in trouble
Do these sorts of things have legal benefits for the companies involved? (yes)
If I had a company over a certain size, I'd probably do it too. But it has sharply negative consequences for the rest of society, and for trust in the system in general.
