Are the links on reddit affect SEO? earn by blogging adsense income

I recently posted a relevant link to my comment on a post asking for help related to business, the link is from my blog that is resourceful to the reader. I am not so good in SEO, but I came across this dofolllow/nofollow tag given to links, which I understood partially. Are all links posted on reddit be a ********/nofollow?

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