I feel like people forget that fan animators don’t have all the restrictions placed on them compared to having an actual job working at an animation studio.
Fan animators don’t need to worry about deadlines, trying to work with the same style as everyone else, having to make sure everything is in the same tone for the show and age appropriate, people telling them to redo animations, make sure that literally everyone else approves of your work, ect…
A lot of fan animators can normally do their own thing at their own pace without having to worry about restrictions or deadlines (unless it’s something self-imposed)