If the chance of winning is less than 1%, then this is usually a zero chance of winning anything, and with a bunch of zeros after the decimal point, even more so.
It’s not technically zero chance but you’re right that you will not get anything on most of your bets. But the profit potential once you beat this hard winning condition is so huge that sometimes people choose to play the hard way with this method aiming to hit this lucky win.
I’m not a fan of this kind of strategy because of negative in every bet and no certainty of hitting the win even with tons of bet.
I don't pay any attention to it at all. I only play multi and I know that I can win. The main thing is not to increase the stakes too much, stick to the strategy and if you manage to triple the amount, then you need to bet half on the payout, and play with the rest and act according to the same scheme.