Yes, it is absolutely possible to build on atprotocol and be a part of the network. We have written a good bit about this already here: https://atproto.com/arti

Yes, it is absolutely possible to build on atprotocol and be a part of the network. We have written a good bit about this already here: https://atproto.com/articles/atproto-for-distsys-engineers https://atproto.com/articles/atproto-for-distsys-engineers (in addition to the recently updated documentation in general)