Then it relies on luck,during these bonus rounds,will you ever go to that final stage of x100 or it will just keep you in the loop and get you bored,only this is the deciding factor.I play manual or autobet,normal spin or fast spin,these do not modify at all the game behavior,again this is just my belief and since you asked I am replying it here.
I also use this method when playing in slot games.
And indeed it all depends on luck, but that way at least I can always get free spins without having to buy them and from my experience in slot games I always get a pretty good RTP and often even get profits even if it's only a small amount.
If we are unlucky, maybe we will just keep playing it until we are really bored, but when we play slot games for a long time or reach more than 1000 spins, a large doubling like x500 will come out and I have experienced it several times, even though I failed to get it.