For a limited time, Microsoft is offering its Microsoft Rewards members an enticing offer to get more people searching on Bing through both desktop and mobile.
Presumably being US-only for now, Microsoft is giving double points on each desktop and mobile search through Bing until 31st August, 2017.

There’s no information on whether this offer will be arriving in other countries, but for those in the US, if you’ve been trying to grab some of the higher-end rewards, now is a good time to get searching on Bing to bag some extra points.