The three clubs you mentioned above have always being in dominant of the league from season to season apart from last season that Girona came from nowhere to take over the third place from Atletico. Both three teams made good signing and it shows that none of them wants to be left out in the title race.
I don't think we will see much from Girona compared to last season because they have sold their hit man Dovbyk and I don't know how the coach intend going far without him. It is Goin to be an interesting season with surprises as usual.
This should be something that we need to care about, because it's a gambling method that many people use. Think about it, if you bet on all three teams to win every week, then you are going to have many weeks that they don't all three win, but when they do, it's a good return. So, is it smart to bet on all three to win? Will it be smart and profitable? Or would you lose enough that the wins will not be enough?
Usually Real Madrid is fine, you could probably make your money back if you bet on them to win every week, it's hard for them to not win, and could be quite profitable, Barcelona ain't that bad neither but they are definitely worse, but we could probably see them do fine too.
ATM on the other hand is questionable, they could have a season where they are better than Barcelona, or they could have a season where they are worse than Girona, we saw both in the last seasons, so it is not like a shocker to anyone. I believe that we could have some issues and it may not be that simple, we need to handle that part. So all in all, we are going to be required to be very careful if we make that kind of bet, or we could just not make that bet, and just focus on something else when betting.