I just searched within the (edit: iOS App Store) App Store app for ublock origin lite “ublock origin lite” For the unquoted search, there are twelve different apps/items returned above it - you really have to scroll down to find it at number 13. Even for the quoted search, it’s returned in fourth place. More interestingly the second time I searched with quoted it’s in third place, and the third time of searching the…
Some commenters are presenting a conspiracy theory about how Apple is intentionally sabotaging App Store search, perhaps with the goal of maximizing App Store search ad revenue. I think the empirical evidence, covering all examples of Apple search, points to incompetence rather than malice. Money does factor in, but again, not in a conspiratorial way: rather, Apple simply has no monetary incentive to fix their own incompetence. It's complacency rather than conspiracy. This is what happens with monopolies and duopolies: they've already got essentially a captive audience, so they no longer need to put in the effort to compete. They just "phone it in", so to speak.
I don't think that Apple wants a bunch of scams in the App Store. But when developers and users are practically throwing money at Apple, no matter what Apple does or doesn't do, and "services" margins are 70%, there's a great temptation to pocket the profits and shrug.
For another example of how Apple is bad at search, look at the Settings app. Awful. But again, it's not sabotage. That would be silly and pointless. It's just pure and simple incompetence and complacency.