Their hardware requirements are pretty clear. Samsung is the only one with comparably secure devices, but they use nonstandard tools like Odin and lock down many security features to the stock OS only.
Other companies are supposedly not making anything as secure.
Also, only Google can really ship updates that quickly and fully, as Android is literally their OS. They are also a huge company, so yeah they have way more resources than a random other company you might prefer.
Example Fairphone, which has horrible update schedules
Their hardware requirements are pretty clear. Samsung is the only one with comparably secure devices, but they use nonstandard tools like Odin and lock down many security features to the stock OS only.
Other companies are supposedly not making anything as secure.
https://grapheneos.org/faq#future-devices
Also, only Google can really ship updates that quickly and fully, as Android is literally their OS. They are also a huge company, so yeah they have way more resources than a random other company you might prefer.
Example Fairphone, which has horrible update schedules