The chance is still 50/50, but the odds of it happening 10 times in a row are slimmer. Here is you proof. Why does Vegas start offering huge odds for parlays that go from 3 to 5 to 7 to 10? The payoffs get bigger and bigger. Vegas knows the odds of each game are 50/50, but the odds of someone hitting 10 in a row or 15 in a row are remote.
You obviously don't understand. Of course parlays pay more the more games are involved because the chance that they hit decreases with every additional game, but that's
before all games started. Once you have already hit four of your five parlayed sides then the chance becomes 50/50 again. Dice have no memory.
Imagine I had parlayed teams A, B, C, D and E while you had parlayed teams V, W, X, Y and Z. Let's assume teams A-D and V-Y had already won, and let's further assume teams E and Z play against each other. By your logic,
both teams would have a significantly increased chance of winning. It's obvious that this cannot be true, isn't it.