and it might be better to drop the thumbs-up option as well. the rating ecosystems have evolved to a point where the stars aren't a bipolar rating scale from bad->acceptable->great but rather a unipolar scale from bad->acceptable. there's a good chance that the same would happen with thumbs up/down, so why not just jump to the inveitable endpoint of "ratings are only used to report adverse events"?
Not sure of their algorithm to generate a score of 1-10 – it’s possible it used more information than just the ternary rating — but their ratings could vary dramatically from sites like Yelp that used the usual 1-5 stars, and seemed to track much more closely to the actual quality of restaurants.
That sounds like a very effective way of getting riders to never leave a 1 under any circumstance.