Again with the FUDing. Self-custodial is a regulatory term. If you hold your keys to the asset, the wallet is self-custodial, no matter ls what the asset is BTC, USDT or L-BTC. Now, the question is how protected the asset itself. With BTC, if you have a way to unilaterally exit to mainnet (which Liquid doesn't, but Spark for example does), you have control over your funds.