I'm not sure why the article picks these 3 options as if that's it.
An RPC API can happily exist over plain old HTTP/1 (no protobuf required) and it also doesn't mention the primary benefit of RPC over REST/RESTish (IMO) - and that's the ability to stack multiple RPC calls into a single request.
An RPC API can happily exist over plain old HTTP/1 (no protobuf required) and it also doesn't mention the primary benefit of RPC over REST/RESTish (IMO) - and that's the ability to stack multiple RPC calls into a single request.