Subway is selling a fugu sandwich. The blowfish is *not* prepared safely. They are very up front about how sandwich artists don’t know how to remove the lethal toxins. Their menu calls it The Final Sandwich, for those willing to sacrifice everything for one last burst of flavor
Whenever I see people talking about their fugu-eating experiences (and I saw it a LOT on the What To Eat In Osaka guides when I went there), they never really talk about how delicious it tasted. QED.