Because ledger has fucked up quite a few times already.
They got hacked, leading to leak a massive amount of data of their customers (physical adresses, e-mail adresses,…)
They also claim that the seed phrase never leaves their device, though they would be able to help you recover your funds by splitting up an encrypted version of your seed phrase and sharing that with two other partners.
Don’t get me wrong, Ledger is (was) a good company for storing digital assets… great UI, ease of use for newbies.
but yeah, they kinda fucked up