> Seriously, why do people need an account to activate/fly?
Theft, for one. Anything that can be re-sold secondhand with no way for the owner to verify it hasn't been stolen will get stolen and re-sold for drug money.
You don't hear mass reports from hobos attacking people for their iPhones any more ever since Apple introduced Activation Lock and Find My, for example. Yes, there still are professionals shipping stolen devices off to China to be parted out and yes, I think we should hold China accountable because there's more than enough evidence at that point, but still, it has drastically cut back on the everyday thefts and robberies.
Same thing along supply chains. A container full of expensive things, no matter if it's drones, laptops, phones or sneakers, is a very attractive thing for insiders - but devices needing activation are, assuming a supply chain able to track serial numbers of devices inside containers, effectively worthless other than for parts and Apple is even cutting in on that "market". In contrast, you have routine train heists for millions of dollars worth in sneakers [1].
For drones specifically, accountability. Governments are sick and tired of consumer drones flown by morons completely ignoring the law. There's old models without remote-id still around from the old days, but eventually these will all die out and by then, law enforcement has at least some way of holding people accountable.
[1] https://www.sneakerfreaker.com/news/la-train-heist-sneakers-...