This is one the biggest pitfalls we see in Influencer Marketing. Advertisers think that they are broadening their chances to work with Influencers by simply opening up an Opportunity to "promote my brand".
This proves to have the opposite effect.
Influencers don't actually want to "promote" anything. They do, however, love to write articles, create recipes, share DIY tips, review products, etc. They are content development ninjas. Give them a topic and let them run with it... but give them a topic.. not the opportunity to promote you.