If lets say they get orders from the government etc can they prevent us from being able to access or move our crypto directly or by blocking access to their software.
I also read that it is possible to get access to our private key ourselves , but we would need to use another 3rd party software to do that.
Ledger generates a BIP39 compatible recovery phrase which can be restored in many popular software and hardware wallets. You would be able to restore your wallet easily.
Rath_ gave the exactly answer to this question.
You can restore your funds in basically any wallet out there.
Ledger and and other hardware wallet are basically just a safe and convenient way to generate your private keys. Once they are generated, you can use those keys in any other software.
if for some reason you lose your device, or if the manufacturer decides not to give updates or even block all the software, you can just download a new third party software to recover your funds.