It's one thing if you sell this physical product or service that a normal human being can articulate into a query. It's another if you're selling totally imaginary stuff, like V-Bucks.
What's the point of writing content for things no one knows they're looking for?
“Fortnite bucks are they worth it”
https://www.google.com/search?q=fortnite+v+bucks+are+they+wo...
“Is it worth getting Tinder Premium”
https://www.google.com/search?q=is+it+worth+getting+tinder+p...
There isn't. But there's great value in writing content your future customers will want to google about on their way to becoming customers.
Take, for instance, an app vendor that sells some kind of cash register software specialized for bars. If you're that, your ideal client is a new or future bar owner, because it's a harder sell to clients that are already equipped with some kind of solution. So you've every reason in the world to create bar creation tips that walk new/future owners through the red tape and caveats of creating one.
...but more of them can than meets the eye at first. In fact, the dating category seems like a prime target:
1. Publish local dating pages, like this one: https://www.pof.com/personals/2700onlinedating.htm
2. When people sign up for an account, promote your mobile app
3. The influx of signups will help with ASO, which will generate more signups, which will help with SEO.
4. Wash, rinse, repeat.
My first site was in the calorie counting space, and we followed the above approach to acquire about 8 million users (our content on the web was related to search terms around food names). Eventually, MyFitnessPal did the exact same thing but much better, and it's still growing to this day using the same strategy.
None. The linked article explains their extensive keyword research to make sure people are indeed looking for these things.
A few years ago I was working for tiny marketing agency and we owned nike and adidas so hard by developing detail content around football boots.
I have done both types of SEO huge gnarly sites at RELEX and was actually pitched an v senior SEO role - I suspect my lack of a degree might have lead to me getting dropped by the Spanish hr team.