I feel like this is a hard question to answer. People who identify as an Effective Altruist come from all sorts of backgrounds and I suppose there aren’t specific groups of people who are more likely to become EAs, as opposed to others.
While I agree this is a hard question + anyone could self-identify as an aspiring EA, I lean towards thinking that right now, EA attracts certain kinds of people moreso than others, as evidenced by Rethink Priorities’ demographic surveys: https://forum.effectivealtruism.org/posts/ThdR8FzcfA8wckTJi/ea-survey-2020-demographics
At the very least, I suspect people who are more (academically) educated are more likely to become part of the EA community.
That survey was just the thing I was looking for. Thank you!