the way it should work for AM is,
FC picks a DEx to use as settlement,
TAT or whatever passthru continues to trade on centralize exchanges to gain the benefit of speed and more broader market,
when user withdraws from passthru, passthru can just execute the change of ownership on the DEx,

no more FC pm/email,

FC uses information on DEx to distribute dividend,
Of course, ppl can also trade directly on DEx, maybe arbitraging across DEx and centralize ones.