Out of every phrase in your report, the opening is the single one where the gap between what it takes to place and what you would be up against is smallest.
It is picked on one of two grounds, and the report always says which. Either Apple reports real search volume for it and the competition is beatable, or no phrase in your report has a volume figure at all and this is simply the least defended of them.
Some reports have no opening. When every search you described is locked up by established apps, we say so rather than promoting the least bad option into an opportunity.