Assuming rich people have more to lose and their share of the losses is bigger, taking into account they support with this money a ton of jobs, 70 000 in Europe alone, is this a form of wealth redistribution?
Nah, that will not always the case, there are no wealth distribution here, it's just gambling per se, you win money to lose money, that's it. It is not something that can sustain someone, in the end the house is going to win and so with that, they are the only one that is going to benefit here, and all the money is going to them, simply as that.
And that is the smoke screen, you thought that they are helping people that are involved in the casinos, but it is not, it's business and at the end of the day, people are going to lose money and the one that is going to benefit is only the casinos themselves.
Of course, because basically casinos and business owners only care about income or profit in running their business, they will never care whether their customers are rich or poor because the most important thing is that the casino has many customers and large amount of money turnover.
Everything that happens must really be personal consideration and responsibility of gamblers and poor people can even spend lot of money to gamble, on the other hand, rich people are not all able to lose their money in large amounts.
In gambling, gambler is indeed required to be able to take care of himself and be able to take the right steps in all decisions taken from each result of betting his money, otherwise the gambler will only continue to lose money.
But regarding the redistribution of wealth as OP said, I think that is also not quite right, basically they run to make money and the workers in the casino get paid from their jobs, saying that redistribution of wealth is an unreasonable conspiracy.