You could fund the channel from a group multisig, but the channel is still single party, the operator can close it to wherever they please unilaterally

Served in what way? If someone in the group is a serious routing operator then the others could connect with him instead of an LSP, not necessarily a benefit to that ... It's be about being able to get hold of them or trusting them if shit breaks

People that just want a custodian they know personally could have an account if the router runs Lightning.Pub or similar