Reddit has a lot of users that spend a lot of time there, so it is advertising potential, and a lot of Brands pay for ads on Reddit. Investors hope they will eventually make enough ad revenue to turn a profit.
However Twitter was and is in the same boat, it is a big site with many users, but was never profitable.
I'm not sure which platform (fb, Twitter, YouTube???) it was, but it did count "unfollow" or "block user/block channel/block post" as negative feedback, limiting future reach of this person's posts to other users of the platform.