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.
I've been using Bing ads to promote CPS offers for the last 6 months and I'm pretty happy with how it's going. Bing ads is hard to work out in the beginning and I had to spend quite a bit of time on YouTube learning the ins and outs of setting up and running campaigns and I'm still getting the hang of it. It could benefit from being simplified for most users who aren't running big institutional brand campaigns or large budgets, but overall it's not too bad once you get past the initial steep learning curve. I've had a few keywords rejected, but otherwise it's been 99% smooth sailing.
Bing is a GREAT search ad network IF you are targeting US geo. It is a HIDDEN gem. I repeat; HIDDEN GEM. I have spent a lot on Bing ads and they convert and they convert CHEAP. Bing is also affiliate friendly, which means you can directly link your offers unlike Google (which bans your account).