While his super PAC has already raised $130 million, it can't run his campaign. Campaigns rely on many continuous small donations which DeSantis is just not pulling in. Mega donors too seem uncertain on DeSantis, and justifiably so given that he has been trailing Trump by 30% points in the national polls for a few months now and isn't closing in. No one wants to fund a loser.
Neither is okay. Super PAC expenditures cannot be made “in concert or cooperation with, or at the request or suggestion of, a candidate, the candidate's campaign or a political party”
That suit was against the FEC for not holding Rick Scott accountable for illegal coordination with a super PAC. He delayed declaration of his Senate candidacy while the super PAC raised funds for him and colluded with him on expenditures. No campaign no foul right? A district court sided with the FEC but the decision was appealed in circuit court Jan this year. The case is still ongoing. Anyway, even if the appeal doesn't do anything, the case does not provide a precedent for collusion after the declaration of candidacy - that's still illegal.