What happens if ledger goes out of business? I recall users being able to access their funds when Ledger had a systems outage some time in the past few years.
With both Trezor and Ledger it is possible to use Electrum as the GUI (interface) app. So if they go out of business and/or stop supporting the specific hardware wallet model that you own, you can continue using it with Electrum. Alternatively, you can import the seed backup (12 or 24 words) into a new hardware wallet.
The users weren't unable to access their funds. However, Ledger Live (their desktop and mobile app) uses nodes hosted by Ledger, so effectively this meant that non-technical users who relied on their hosted nodes couldn't access their funds.
One could (and should!) still use the same wallet with a self-hosted node, or a third-party one, by using the wallet with a different software (which is also officially supported; Ledger provides docs for doing so).
