These kind of products are nice-to-have and easily substituted by free alternatives, except for very narrow specific niches that need some of the more advanced functionality (in our case, music teachers). For the general user, these tools are also too tedious/involved to be sticky in the long run. Computer tools with nonlinear/nontrivial interaction only work in the professional space were you _have_ to deal with the complex UI to get your job done because there is no simpler substitute. But this is not the case for creative moodboarding etc: you can use paper, whiteboards, random drawing software. My point is, tools like these tend to be too shallow for professionals who would maybe pay (but they would need more pro, expensive/impossible to build features), and too complicated for the casual user who wouldn't pay anyway. "Prosumer" tools like these do not solve a big enough problem/pain to be viable in a meaningful financial way IMHO.