So, a year later, the biggest losers of the cancellation of 2020 Worlds:
Men:  Aliev?  The men are so up and down, I don't know if there is a clear loser here, the only two people guaranteed to podium at 2020 Worlds still did so in 2021.
Ladies:  Kostornaia "wins" this in a walk;
Pairs:  Boikova/Kozlovskii, I guess? Even if they hadn't beaten Sui/Han, they were shaping up to be coronated as the top Russian pair. They still got a medal at least, unlike the others listed here.
Dance:  Chock/Bates, sigh.  And maybe P/C too, since they lost the chance to mount a title defense.
The biggest winners:
Men:  Yuma Kagiyama, and to a lesser extent Kolyada and Messing, all of whom weren't going to be there, and used the opportunity to establish or re-establish themselves in the pecking order.
Ladies:  Tuktamysheva, easily.
Pairs:  Mishina/Galliamov, what a difference a year makes.
Dance:  Hubbell/Donohue, Gilles/Poirier (it feels very weird to say they're winners out of having their home Worlds cancelled, but it seems like they are)