signing up to try a programming language (Mojo) is as bad as logging in to your terminal before using it (Warp).

Co-founder here. There isn't any signup - that was 2+ years ago and we've been iterating a lot with the community and listening to feedback - which has been wonderful. Go freely and install with Pip, UV, Pixi etc -> https://docs.modular.com/mojo/manual/install