Many people choose to avoid engaging with the movement due to the general unspoken feeling of "you're not doing enough unless you meet our high expectations" - in fact, one commented exactly this in response to this post.

Datapoint - I too have felt unsure whether I'm doing enough to justifiedly call myself EA. (I have both worked for and donated to MIRI, ran a birthday fundraiser for EA causes, organized an introductory EA event where I was the main speaker, and organized a few EA meetups. But my regular donations are pretty tiny and I'm not sure of how much impact the-stuff-that-I've-done-so-far will have in the end, so I still have occasional emotional doubts about claiming the label.)