I do agree that everyone looses in the long run.It does not matter of professional or immature gambler.House always win in the long run everywhere whether it is online casino or offline (physical).When two professionals compete with each other there too only one of them wins.
Its why every game in the gambling industry is a form of a illusion to make you play their rigged rules.
You win anytime of their games youre officially going to be coming back. Hence the illusion part where they think they will win again.