Ndolo and Tschorsch recently published a paper indicating that a network-level adversary could censor payments in the lightning network.
nostr:npub1az9xj85cmxv8e9j9y80lvqp97crsqdu2fpu3srwthd99qfu9qsgstam8y8 and nostr:npub1p4kg8zxukpym3h20erfa3samj00rm2gt4q5wfuyu3tg0x3jg3gesvncxf8 discuss the issue of LN communication privacy risks and malincentives in BR087.