I don't agree with the 3rd one. I'm actually doing this. I deposit a small amount not only for fun but also for profit if I am lucky, and if I lose this amount, I stop, then do it again on the next day.
Depositing a lot of capital to gamble is pretty risky, in my opinion, if you don't have risk management.
About the 4th one, I don't think there's a difference between using the winning amount to gamble again. I don't see any difference because later or tomorrow you will deposit again to gamble.
Maybe I think to feel that you win, you need to withdraw 80% of your winnings and the remaining amount use it to gamble again on the next day.
To either gamble with a huge amount or not is completely dependent on the gamblers pocket in the sense that there are different levels of players in the gambling field such that the amount that I will consider to be too huge for gambling can be a chicken change for the next gambler, what am trying to say in essence is that the advice should be more saying that one shouldn't use the amount that they can't let go in the case of lost, I can decide to gamble with an amount that might look way too big for you while it is small for me, anyone can do whatever they like with whatever amount of money that is considered to be a spare money because gambling is not an investment it is our left over cash after taking care of our important needs, yeah I quite agree with that there is nothing absolutely wrong if gamble from our winning amount, I usually do that each I win I will cash out part of winning amount and leave the rest for my gambling instead of funding account the next time.