If you're writing quality posts and using links sparingly, I don't think you're going to have any problems. I replied to another commenter saying that if you get questioned about it, I'd say something like this:
I know affiliate marketing isn't something people do much on Steemit yet, but I think it's actually highly-beneficial to the Steem ecosystem. I'm writing posts with certain search keywords that may end up getting picked up by Google. If they do, that means more traffic for Steemit. More Steemit traffic means more Steem accounts being created, more demand for Steem, and ultimately making your Steem worth more. I'd argue that more people should be writing posts for Google's eyes. It's one thing that will help make Steem huge. Plus, if Steemians are earning money from affiliate marketing, they'll have more cash to purchase Steem Power. This would also benefit the Steem price.
Good answer :0)