It's quite literally impossible to play online gambling at a net gain long term. the games are rigged so your chances of winning are low enough that it's impossible for them to be at a loss.
It's like throwing money at a 0.5% of winning over and over. sure you may get lucky and hit the jackpot as a new player but the moment you start going for a 2nd jackpot you'll be putting in more money than you'll ever make.
Had a friend who ended up getting a gambling addiction and it was so disturbing to see even though she was a smart person, she got lucky initially and things just started going downhill for her when she refused to cash out.