Took a ride this evening and afterwards was having a look at the app when I noticed it said 90% off an Uber One subscription.
Cost is $9.60 ($0.80/month) which is charged up front. I got offered this after having a free 6 month membership of it from Mastercard (I cancelled and did not renew)… assume it’s targeted.
Only showed up in my account section of the Uber app as a banner.
Looks like it's a targeted promo as my app doesn't offer this.