It's common for clients to overstep when hiring freelance writers these days. Writers are expected to wear multiple hats, and clients are rarely willing to pay more for these added services.
The Northeast Ohio Media Group's "zero-tolerance policy" on typos is an insane example; writers are expected to have their spouses edit their work after copyeditors were dismissed. Blog owners are an even more common example, expecting freelance bloggers to handle everything from social media marketing to licensing (or even taking) photographs to supplement their content.
None of these things are appropriate, at least not without added pay.
These clients try to make their problems your problems. But they're not. It's up to a client to make sure they can afford everything they want (ideally from qualified providers -- writers, photographers, editors, marketers, etc.). And it's on them if they purchase content without having a clue how to monetize it or use it to reach other goals.
As a freelance writer, if you're asked to provide extra services, you can always refuse. Find clients who respect you as a writer first and foremost. Or charge appropriately for any extra services you are willing to commit to.
This is the topic of a guest post I wrote for Writer's Worth Month, run yearly by Lori Widmer of the Words on the Page blog. Check it out. Share your feedback. And catch up on some of the other posts in this year's Writer's Worth series.