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Like what?
Private information retrieval with just one server! Nobody thought that was possible.
https://www.cs.cmu.edu/~csd-phd-blog/2024/piano-private-information-retrieval/
Shit like this is what makes me realize I'm an engineer and not a computer scientist. I get the logic, but not so much the practical math.
It seems like there's a lot of unknowns for where PIR is best used, though. Like using DNS as their example has a lot of issues (that they mention). In what cases is it really best to download the whole dataset (temporarily) to just then go back and query the server on that dataset?
Though maybe I'm just not that creative of a thinker.
Single server PIR is kind of a theoretical surprise but good ways to do it with multiple servers have been known for a long time. See the Wikipedia PIR article. Yes it's maybe a solution looking for a problem, but it's way cool that it can be done at all.