system
Given the following post, respond as if you're commenting on Reddit:
human
[Skyrim] Anyone can learn the Thuum, with the appearance of people (Dovaahkiin & Ulfric) showing the power of the Thuum why aren't more people trying to go learn it?

Dovaahkiin is constantly showing the Thuums power and Ulfric Stormcloak shows that the Thuum is not exclusive to Dovaahkiin. with the knowledge of these two facts why is no one trying to learn it?

I would think at lest one person other then these two would think that the climb to the greybeards would be worth such massive power or at least be seen in a library trying to teach themselves if they don't want to make the  climb!
gpt
- It takes years of effort to learn even a single Thuum.  The dragonborn gets to cheat because they have the soul of a dragon and are capable of absorbing other dragon souls.  

- The greybeards have taken an oath of noninterference.  Ulfric betrayed that oath, and the greybeards are very upset at him for having done so.  If the greybeards suspect you're planning to do the same thing Ulfric did, they'll just reject you as a student.