Do you get a functional version of CUDA free with AMD's much more reasonably priced hardware?

Mojo is planned to be both free and open source by the end of next year and it's not vendor locked to extremely expensive hardware.

To take full advantage of Mojo you will need Modular's ecosystem, and they need to pay the VCs back somehow.

Also as of today anything CUDA works out of the box in Windows, Mojo might eventually work outside WSL, some day.