The public had lots of say in the rules. You were free to comment on the rules during the mandatory public comment periods on draft rules before final rules were issued. And what the court ruled was Pruitt must go through the roughly two year process required by administrative law to change the rules which will include at least two public comment periods where environmentally minded citizens will file comments in opposition to his rule changes. And he will be sued if all comments are not acknowledged and responded to, with courts throwing the rules back at the agency to comply with the law on administrative procedure.

Note, the notice of comments, and of all action must be recorded in the public Federal Register so you did get official notice, and environmentalists will get notice of Pruitt's efforts so they will respond with lots of comments.