So it turns out it was talked about in the Feb company earnings call. This does follow the letter to shareholders in Nov about Block dialing back its investment in Tidal and TBD (its decentralized web project)

https://www.benzinga.com/25/02/43873297/jack-dorseys-block-is-really-excited-about-this-bitcoin-mining-initiative-that-aims-to-challenge-the-dominance-of-foreign-firms