What happens if I don't report small crypto gains?

If I were to inquire about the consequences of failing to report small cryptocurrency gains, I would pose the question as follows: "Could you elaborate on the potential repercussions one might face for neglecting to declare modest earnings derived from cryptocurrency transactions? How does the tax authorities view such omissions, and what steps might they take to address them?" Essentially, I'm seeking clarification on the legal and financial implications of overlooking to report seemingly insignificant cryptocurrency profits.