At same time, if you keep placing bets on the strongest team, you will make only minor profit, like 0.10x per bet, meaning you have to win 10 times in order to double your base bet. And in 10 matches, it's quite likely that team won't win all of them, possibly losing or drawing one or more matches. If something like that happens, you will be already at loss. So even though risks are lower, it doesn't worth on long run.
Coupled with the fact that there are times where the underdog teams are mostly on fire, and the big teams tend to lose more times than they usually win, for someone using this sort of strategy, it could mean serious trouble for them fr. I used to feel like this strategy was just another sure banker, and though the odds were quite small, I felt they were worth risking and I risked them, but I learned the hard way.