They aren't Layer-Two's, any implication that they are is an affinity scam... They are simple applications with niche use-cases.

Fedi/Mint - Is obfuscation for political entities that don't want to reveal who is the actual bitcoin custodian. It uses federated nomenclature despite the fact that Bitcoin cannot be federated, the purpose of which is med-large organizations can be custodians while hiding who is responsible by pretending that responsibility is distributed.

Liquid - Is Blockstream as custodian, but with an SDK that allows for naive/novice to wallet developers to pretend their projects are non-custodial by passing the blame to a bigger company with more legal and media resources to scam the regulator.

Cashu - Pure virtue-signaling retardation about privacy without substance, but is well-funded by NGO's and Neobanks that might extend their relevance if they're able to protocolize bank accounts.

They've shot themselves in the foot now by labeling themselves L2's, that opens the door for new fake L2 scams like Ark/VTXO's etc to compete on similar properties to Liquid, but without the network-effect for now.