If ArcelorMittal is not one of the Clients A,B or C, they could be a potentially valuable research and development partner:

‘XCarb™ innovation fund’

ArcelorMittal has launched an innovation fund which will invest up to $100 million annually in groundbreaking companies developing pioneering or breakthrough technologies that will accelerate the steel industry’s transition to carbon neutral steelmaking. To be eligible for funding, companies will have to be developing technologies which support ArcelorMittal on its journey to decarbonise. The technology also needs to be commercially scalable.

https://corporate.arcelormittal.com/media/press-releases/arcelormittal-launches-xcarb-signalling-its-commitment-to-producing-carbon-neutral-steel