Generally, since casinos have existed there has been a house edge on every single game. No matter what you are playing the house will have some edge. Depending on what game you play this could be lowered but it is commonly thought that every game has an edge. To get the best odds of winning many people will try to find the game with the lowest edge and end up playing Blackjack or Craps to try and give themselves the best odds.
What many people don't know is that there is actually an online crypto casino game that has 0% edge. That game is Howls' Coinflip! (https://howl.gg/coinflip) While all other casinos take a % of every bet even on a game like coinflip, Howl has a 0.00% edge on coinflip and takes NO rake from any games played. This means you are getting a true 50/50 when playing this game and the house is not winning anything!
For Example: On most websites if you place a $10 coinflip you will likely win $19 and some change if you win. This is because when you place that bet the casino takes a percentage of the bet. On Howl if you place a $10 coinflip you will win $20 if you win!