Do the math.
99.96%
I would need 2 dice, each with 500 sides, and roll a snake eyes on the first roll in order to match my chances of getting Covid and losing the gamble.
With the Inoculation gamble, I would have to roll those same 500 sided dice and get snake eyes in order to win.
The Inoculation gamble only wins if you actually get Covid.
Actually, even then you lose.