Ok, wow, I'm really impressed and I've spent the whole morning looking into this space and the game itself.
So it does look like there is this one Italian guy who started to create a mobile game portfolio in 2017 and now his games are getting millions of downloads A DAY.
His latest "Offline Games" hit is not even 1 year old.
Revenue-wise I'm not sure, but with all apps combined, I wouldn't be surprised if he would be making easily $500k-$1m+ a month (@theshanal says it's $100k-$200k a day)
Not sure if he has a team now or if he's still solo, but his games are wildly successful. At the best part? It looks like it's mostly organic and he didn't really invent anything new with his games.
I didn't find any paid ads for his games (SensorTower also didn't display any), so I wouldn't be surprised if it's 100% organic.
How did he do it?
1) While his games aren't innovative, they are high quality. He enhanced existing games and made them easily accessible from one app.
This is something I keep repeating -- you don't need to be innovative and come up with something novel. It's enough to take something existing and create a better version of it (+and then nail the distribution he he -- I know, easy to say).
2) He nailed the distribution. I've seen "offline games" trending for years on the app store, but it seemed that very few apps targeted the keyword directly in the title (?). He repeated this for some of his other apps as well. Created an amazing game and put the main keyword in the title. He also localized them properly.
He also owns SEO search results, just search for "no wifi games".
On top of that, he cross-promotes his games within his game portfolio which drives even more traffic and helps with ASO and SEO.
3) His apps are user-friendly. They don't have aggressive monetization tactics. They work as advertised and the ads are not that annoying.
7 years in the making and he nailed every bit of it -- I assume that came up with years of experience in this space.