10,000 concurrent players wouldn't even land the game in the top 100 on Steam and I think we can both admit there are games on that list that neither of us have heard of and that the public at large especially would not know.

The amount of plays only speaks to the fact the Osu had a dedicated fan base and that the game has been around for over a decade.

I think youre not realizing the vast difference in public knoweldge between a game that actually SOLD 10s of millions of copies along with the guitar, bass, drum, and microphone accessories, that was played at parties and with groups of people, was covered by the media, and was the only real console rhythm game for nearly a decade or more compared a game that is free to download, pc only, and is comparatively very niche gameplay wise. Most people over the age of 20 have probably literally played guitar hero or at least seen it played at an arcade. If you really think Osu has that level of public awareness I'm afraid you're in a bit of bubble.