gambling is not supposed to be a charity (even though it would be interesting to see gambling with charity components
losing it all is never a good idea, it can be painfull and emotionally disturbing, much better to avoid this possibility completely if possible
always avoid the risk of ruin
I have no absolute knowledge of whether there is any inherent connection between charity and gambling, but I believe so in my opinion.
Gambling is never a charity, a charity is a designated fund for donations. There is a process of just donating to charity, on the other hand, if you lose in gambling, all the capital is more likely to be ruined.
That's the actual reason why I mentioned that it isn't a charity and it was designed to make money and not to give any money to their participants, just like what you just mentioned, when you lose to gambling everything got ruined and there's no way that you can recover that unless you will try some luck though it might add more to your losing amount if luck won't allow you to win.
It's something that most gamblers needs to understand, play with an amount that you are willing to let go and avoid exceeding to prevent any aggression that may push you to keep aiming for more.