That's a good point. The custodial wallets and services that form part of the Lightning Network can indeed be seen as a centralized element of Bitcoin, despite its otherwise decentralized structure. As such, it is important to be aware of the potential risks of using these services, as they do not provide full control over one's funds and may result in the loss of coins if a service is compromised. It is also important to make sure that you keep the private keys of your coins safe and secure, and to be aware of the different options available when it comes to storing your coins.