Some buyers surprise me, they want a review but order a gig for a Google Ad. They want entire paragraphs rewritten, but order a gig for headlines.
This is a mistake. Never assume that a writer does all kinds of writing. You wouldn’t hire Stephen King to write you a romance novel, nor would you ask a tattoo artist to proofread your resume.
There’s no reason to be confused. If someone sells “I will do a logo for $5,” I’m not going to assume he does book covers or Facebook page pictures. If I need something else, I will look at his other gigs. If I’m really desperate, I might message him (and I hate doing that since it’s annoying to both the buyer and seller) and ask “can you do this image in these dimensions?” Chances are he or she can, but why assume?