I am not quite sure how long this has been around, but I just came across a pretty cool way to rack up your Uber credits. Uber is offering “Visa Local Offers” where if you have a Visa credit card linked to your Uber account and you eat at a participating restaurant or shop at a participating store, you’ll receive 5% of purchaes back to your Uber account. 
All you have to do is go into your Uber app and at the bottom scroll up. Currently, my app shows an offer for an Uber Visa Credit card and if you swipe up on that (not clicking the Apply Now button), the Visa Local Offers will appear. Scroll down a little more and select Search for places. This will bring up all participating restaurants and shops within a 100 mile or so radius.
If you 
You can see the specific requirements of purchase by clicking on the merchants name. For example, this random restaurant that I clicked on below it says that you’ll receive a maximum of $20 back in rewards for your purchase. Most of them have either a $20 or $50 credit which is still really really good.
Just make sure you have a Visa linked to your account (any Visa, doesn’t have to be the Uber Visa credit card) and you are good to go. No need to “opt” into the offers or anything. Ultimately, if there are any merchants that you shop/eat at often, this is a great way to increase your Uber account credits!
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When it first came out, the returns and number of places offering credit were much higher. Still better than a stick in the eye, but I miss those days.