You said we can not win over house in the long run in online casino so I assumed that you are saying we can win long term in real casinos.
If you play smart, you can. Count cards in card games, especially in poker and blackjack. Play alone in the table, so you can know all cards in deck.
Card counting in blackjack is not as effective as many imagined. The house can shuffle the decks more often, or they can ask you to leave and ban you from playing.