Not entirely.

I bet you haven't been around this forum yet.
You will see some well documented winnings from different users here.
Suppose you are betting in an online sports casino? It is your choice which team or player you are betting for.
Players would not deal with casino owners to shave points just to gain the win. It is illegal.

You are in gambling discussion though, so you will see a lot of threads about online casinos. You might learn some points on how to win.