Codswallop and blatherskite.  They did no such thing.  

First, the cert vote was 6-3, not 9-0.  

Second, the vote itself only means they put the case on their upcoming Fall docket to be heard and argued in full then.  The Court stresses, in its decision, that this vote in no way signals they're predisposed to one side v. the other.  

Third, the partial lifting of the ban is a sketchy prognosticator of how the Court will eventually rule.  Somebody could get rich if they played the odds right on this one.

My assessment is, they took the case largely because it hinges on a core Constitutional issue, the separation of powers.  And they certainly jumped at it.  (Attention all conservatives:  We may have an Activist Court sighting!)  

This could be a landmark case, whether decided narrowly or broadly.  Everyone should familiarize themselves with the decision itself:

https://www.supremecourt.gov/opinions/16pdf/16-1436_l6hc.pdf