I agree it's very bad to increase stake when you are losing in order to try to chase your losses but I don't think it's a bad practice to continue when you start to lose, because you can't always win you are playing and most times you need to lose many rounds before reaching a big winning or a jackpot, we see that many times at Roulette or slots for example or at Baccarat, Blackjack and Craps when we get a big winning streak after a losing one.
This is what happen when you can’t control your emotion and also don’t know when to stop.
Increasing your bet will not increase the probability to win, this is a misconception and many already fall for this trap. It is very important to know when you can place your bet and also when to take profit, its just a matter of timing with luck and then you can be good.
if you are playing a luck-based game, there will be never an assurance that you will be on a winning side even if you slowly increase your bet and be very careful with progressing your game. do remember, luck is always in play on this type of game no matter what and coupled with the house edge for a particular game, you are always doomed to the losing side if you won't stop playing.
this is why those who got good winnings can still go home as a loser because they don't stop playing up until their bankroll is empty. this is the dilemma of most regular gamblers, they can't stop their impulses of continuing their game even if they already got a handsome amount of winnings.
so yeah, the concept of increasing your bet as you progress the game doesn't have good ending all the time. in most cases, you will get wrecked pretty badly if you continue thinking that you will be winning on your next big bet. so such piece of advice is not true at all.