It's not, Phoenix is a non-custodial wallet. They provide one shortly-custodial service to on-board on the Lightning Network (to provide a seamless experience, but you can do the process manually with your own node if you prefer). Once the channel on LN is open, it is non-custodial and trustless.
For Hardware Wallets, plenty of other providers exist, exempt of data breaches and dodgy services unlike Ledger. For Bitcoin Coldcard comes to mind.
For the risk of physically losing your keys, seems like a less random, more in your control, risk than trusting Chase Bank, see OP.
> trusting a crypto custodian
If that's your choice, at least you have the option to avoid this with crypto... that's one thing I will never get with people who systematically bash Bitcoin, nobody forces you to use it, it provides you optionality and full control of your assets, something traditional bank and fiat do not offer at all, you are forced by the state to pay your taxes with the currency they tell you, you are practically forced to use banking as a cash only life is pretty complicated these days... so why hate on a new option.