Users could tell which links are affiliate if there was copy on the page making it clear that "orange links that say 'buy' are affiliate links - if you click th

Users could tell which links are affiliate if there was copy on the page making it clear that "orange links that say 'buy' are affiliate links - if you click them and make a purchase Referly will make a commission on the transaction. That's the business we're in. Thank you!" I don't think you have anything to lose by being upfront with your audience - they'd probably appreciate it.