The Talmud says:
The Sages taught that there are three for whom the Holy One, Blessed be He, cries every day: (1) For one who is able to engage in Torah study and does not; (2) for one who is unable to engage in Torah study and yet does it; (3) and for a leader who lords over the community. [Ḥagigah 5b]
Why the second? Because he might then teach things that are not true? How do we know he is unable? Isn't everyone supposed to study Torah without restriction?