according to the proverb gambling only make miserable, so I think if there is free use only, do not use capital and if you want to use a minimum use of capital
If you don't use capital then its not considered gambling because you are not actually risking anything. Its like playing Blackjack on your phone for fun, its not actually gambling.
Well, we can consider this as "time gambling" where you waste your time, but who knows what you might get from wasting such. Lol.
But in the end, you're still tired anyways, but gained nothing.