I would prefer if the FTC banned celebrities from endorsing financial products instead of an ad hoc system of suing people after a scandal (of various size).
Otherwise - I'm not sure how this would really ever work. Will commercial directors and producers also be found liable? What if you endorse something like a normal Visa credit card and then three years later there is a scandal at Visa? What if FTX just lost 3% of customer funds? What due diligence could Giselle really have done? FTX was invested in by respected VC and SBF was featured positively in Forbes and the traditional media.