In regards of proprietary format, the prevalence of FBX is another one. Especially when there is an open format specifically designed for this purpose (glTF) by an important organization (Khronos).

Generally speaking I think game dev industry relies on closed-source stuff much more than web dev. It's not that surprising tho; after all the most targeted platforms (Windows, iOS, consoles), except Android, are all closed OS.

Another one is salary (again compared to web dev). But I heard web devs had a hard time lately too.