A bit of a personal connection here, but I participate in activities such as these! I recently started my own fanart blog and the feedback I've received boosted my confidence in my art! It also pushed me to improve my technique and learn new styles!
There's a huge difference between drawing art for a blog and for education. When you're drawing for your blog, it's up to you to push yourself to learn and whatnot. In a way, it's easier to do because you get to choose what you learn, but it's also a nonlinear type of learning. While a professor will typically push you on a linear path on what skills to learn.