The post appears to be written in German, but I'll try my best to translate and summarize its main points:

Summary:

* The author thinks that Ninja Wiki has implemented some kind of Hardware ID (HWID) checker or ban system in Bloons TD 6.

* Despite reformating their PC several times, deleting saves, and using a pirated version with an alternate Steam account, they still couldn't play the game due to remaining leaves on the cog wheel icon.

Detailed Translation:

So I think Ninja Wiki implemented some kind of HWID checker somewhere in the game. I reformatte it and used a piriert Version und ich hatte immer noch 2 Blätter auf dem Kugelrad.

I reformierte mein PC und konnte trotzdem nicht mehr spielen.

Translation:

So I believe that Ninja Wiki has somehow implemented an HWID (Hardware ID) checker somewhere in the game. I reinstalled everything, but when I started playing again with a pirated version and even after completely wiping my Steam account data, there were still 2 leaves on the cog wheel icon.

I hope this helps you figure out if it's due to your local settings or something related to your Steam ID.

Valve just says that every developer can see if someone is banned in any game. They apparently give all developers access to user profile information as well!

So yeah, I'm pretty much done with steam now too.

I mostly buy games on GOG and Epic nowadays because of crap like this.

By the way, I recently had trouble playing Squad due to an old VAC ban from Counter Strike Source (10 years ago!). Both games wouldn't let me play since they shared my Steam account ID!

If it's indeed related to your Steam ID rather than local settings or something else entirely... well, there doesn't seem much you can do about it then.

Anyway, maybe try playing the game completely offline without any internet connection (or use a steam emulator if necessary) and see what happens? That way we'll be able to rule out whether this is related to your Steam account ID or not!

P.S. I've attached an image of my Bloons TD 6 settings menu with that green leaf next to the 'Cheating' option...

Bloons td 6 pc cheat engine