If I were to buy candy from those instant candy dispensers and set my fee to $0.00001 then immediately send all my funds to a different wallet with my fee set to $0.01000 what would stop the 2nd transaction from getting into the next available block nullifying the 1st transaction?

submitted by /u/otherwisemilk
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source https://www.reddit.com/r/btc/comments/bkkyn5/if_i_were_to_buy_candy_from_those_instant_candy/