I think I disagree with this. I taught myself web dev mainly through Udemy courses and managed to land my first dev job through that. I've been working my way through Algomonster and Neetcode and, as someone with no formal education in computer science or programming, it's been filling in some gaps in my knowledge and I've mostly been enjoying the process. Some things I saw in the code base at my last job that I didn't comprehend fully at the time now make a lot more sense.