He's only accountable to Congress (SCOTUS also affirmed that) and good fucking luck ever getting the required votes to remove him from office. He can do whatever he wants with impunity.
SCOTUS pointed out that they weren't crimes committed by Trump. We then saw the political prosecutions of Trump backfire spectacularly in a way that strongly suggests that the balance of the US population agreed with the SCOTUS call that the prosecutors didn't have a case that Trump had to answer for.
No, SCOTUS ruled that the President is not subject to criminal prosecution.
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On many, many occasions, the courts have ruled executive actions invalid.
On no occasion, have courts assigned criminal liability to a President.
SCOTUS explicitly affirmed that as the rule.