WieWaldi I think there is an unironically legitimate question there, even acknowledging the sarcasm.
I think a big part of the Youtube code behind this person, or Kassia or Rousseau ie. the other big most popular channels, is that they lean into the achievability of their own level. If one is fortunate to start young and have consistent lessons with a good teacher you likely would play at if not well exceed their level in 10-15 years. They're completely unthreatening to the ego, the average viewer's perception of their own potential at the instrument.
If you keep going on the virtuosity scale to Traum and Valentina Lisitsa, they only have a fraction of the LV/Kassia/Rousseau subscriber counts. So there's an inverse correlation between virtuosity and relatability. Somewhere above LV/Kassia/Roussea and below Traum/Lisitsa level, as soon as the viewer loses the ability to believe the illusion of 'Hm I can maybe play like that day' they will not support that person.
Then to go even further on the virtuoso scale, Yuncham Lim who's more talented most of these combined, has a fraction of a fraction of the subscribers despite crazy exposure and virality he got from winning the Van Cliburn.
I also think this is also how a lot of other fields work too. People love trash artists compared to a great vocalist because they can entertain a possible reality where they can be just like a Sabrina Carpenter or Lizzo, at least in their natural vocal chords. Whereas every day, just talking and hearing their own voice is evidence they cannot and would never be an Amy Winehouse in any reality and there's some subconscious aversion to that level of talent, for some personality types.