My first thought was to wonder what the impact is on existing hydrothermal ecosystems.

The Axial Seamount area is not at all some dead barren zone we can just tap into without concern for ecological harm. Hydrothermal vent areas are very vibrant ecosystems that influence deep ocean ecology in ways we already understand, and probably ways we don't yet understand.

I am glad to see in their press release [1] they do mention careful selection of sites, conditions for operation, and ecological monitoring. And the area is already the focus of oceanographic research by various institutions.

[1] https://www.enduranceenergy.com/press/adelie