there is nothing stopping it, it's really easy to implement, at least in #golang i could have a gRPC/protobuf version of the protocol working in a matter of a week or two

the only minor hassle is that checking signatures on events requires converting them into a special format of json array, to get the id hash, but for lazy checking you can just enforce a uniqueness invariant on the ID (bake it into the key value store) and just check the signature matches the ID and pubkey, a single time on receiving an event you might have to actually construct the canonical form and validate the hash matches the ID, technically that's it - match the hash, hash to the signature, validated, it's a shortcut but it's secure