The question will ultimately arise "by what authority can the FTC make such a sweeping judgement" and it would not surprise me to hear the SC rule that this is an overstep of the authority they were given by the laws creating and maintaining the FTC.

Previously, the FTC could have argued that the chevron doctrine gives them this right. However, that is almost certainly about to be completely abolished this term.

The right of contract is almost certainly going to be more important to most members of the supreme court than any other considerations. That's my 2 cents.