So semi odd question
For like 3.5 hours a month I update/write Wikipedia articles. As my ECs are just about filled the remaining slot is saved for a eventual job. Would this be okay to add to extra info or is it not worth it.
I would say that writing articles for Wikipedia is not that great of an EC, because there is a relatively low threshold for entering(which means anyone can do it). Since all of your other EC's are filled, I would say that you are already doing a great job, and you should just leave it like that. Maybe you could write for a blog that accepts submissions from high school students. Or you could start a club that scans Wikipedia and looks for errors in its content. Good Luck!
I think it depends what your other ECs are. If they are related to writing or journalism, then maybe it adds another detail to your story. But I really don't think college admissions officers will care that much about something on the bottom of your list anyway, at least compared to some of things you write your essay on. Just consider this, if you are spending more time doing your Biology Homework than doing your thing with Wikipedia, A.O.s probably won't really see it as anything special... unless you sell it to them somehow. Good luck!
I think it will depend on how impactful you other extracurriculars are, for example did you start a club at your school and raised $1K in a fundraiser or did you put extracurriculars where you were only a member for three years? If your extracurriculars were already impactful, then it won't be worth it. Also, I think since your ECs are full, it's also not worth it to keep dragging on your list unless you have done it for a long time like 3 years. Also, I believe that you should only put very important extracurriculars rather than putting in everything you did. I hope this helps.
To keep this community safe and supportive: