Ledger is closed source. Especially if you use it with ledger live, that means that nobody can examine or verify the code running on the device or on your computer.
All the wallet companies will not go extinct, but it doesnât matter if yours does. Coldcard doesnât create software for instance. You have to use a Coldcard with generic software like Sparrow Wallet, meaning that once you buy the device it doesnât matter what happens to the company. You can even use a ledger with most generic software.