How is Lido non-custodial?

Could you elaborate on how Lido operates in a non-custodial manner? I'm curious to understand the mechanisms behind its non-custodial nature and how it ensures the safety and autonomy of its users' funds. Additionally, how does this approach differ from traditional custodial services, and what are the benefits it offers to its users? It would be helpful if you could provide a concise yet comprehensive explanation.