Agree but if you think like that than there is no way to play 100% skill based game online in fair situation, everyone can play bot against you and there is a high chance you'll lose. But on another hand there is a game which I just reminded, something like penalties. You have 3 chance, your opponent has 3 chance too and you kick penalties to each other. One kicks and another one is goalkeeper, one chooses corner and GK chooses also, it's 100% luck but fair lucky based games, then they swipe the roles and so on.
Another example that was listed here was the Agar.io clone who play for btc leaderboard.
The website I mentioned in my post where you have to write rules about your bot to climb.
Both of there are still skill-based, but automating something to have a 100% winrate is impossible. For chess, and similar solved games, it is
proven impossible for a human player to beat the best chess bots with enough computation time.
In addition to the fact that it's very easy to get access to such bots, chess or similar board games are just not worth risking money on.
Also kindly try to remember websites whenever you mention examples, I'd be interested but I need to try them to judge