Bing ads (now Microsoft Ads) is the best for people who want to start getting into paid search traffic and affiliate marketing. They are not too strict and even allow direct linking to offers.
I've made my first ClickBank sale using this traffic source. The only thing to consider is that it has lower volume compared to google and during my first try setting up a campaign, I wasn't getting any traffic at all for the first 3 days.
But if you could master this traffic source then you can scale your campaigns on google and/or offer your services and run Bing Ads for other people/business.