I tell you something that its logic to me. I will try to keep it short. Lets say that are 1000 active players on an online poker platform from which 10% are pro players. From those 1000 if only the 10% were the winners at the end of the day, week or month as it would be to expect like in reality, than how a poker site would keep the other 90% of players active so they can take a rake that would keep the site alive and sustain a monthly income? Simply trough rng. An rng that will make all players have a 50% win rate. Its a business and all comes down to money. To make a profit they have to keep the money moving around from player to player. Sorry for any misspelling
