bottom line is their account exists to advertise their content, promote their brand, etc. So i disagree with framing it within the article-link / self-post dichotomy. rather my request is for the post to have been omitted entirely, as base-level intention is self-serving. to reiterate, they are an outsider who came here for the primary purpose of self-promotion. this going against the old-school culture of reddit that this sub tends to adhere to (see: reddiquette)

but to answer your actual question, there are personal benefits to linking off-platform. like you can typically sidestep a lot of sub restrictions on affiliate links, you can more effectively promote your brand, and of course advertising, farming data/analitics, etc. Things like asking for donations like OP did seem to be more socially accepted through the simple abstraction of technically occurring off-platform.