Possibly targeted? I only received this at one email address I have registered with Uber.
Save 20% on your next 20 trips this week —whether it’s a big night out or a quick, morning commute. Your promo has automatically been applied to your account and is valid through September 18, 2023 12:00 AM.
T&Cs:
Maximum savings of A$24 per ride. Valid for up to 20 rides. Offer expires at September 18, 2023 12:00 AM. Valid only on UberX, UberXL, Pool rides only (where available). Offer is applicable only for rides taken on a personal profile. Promotion does not apply to surcharges, government fees, tolls, or tips and cannot be combined with other offers or savings. For accounts with multiple valid promo codes, the promo with the highest savings will automatically apply to a rider’s next trip. Offer is non-transferable. Offer and terms are subject to change. Offer is not applicable on trips booked with Uber Reserve.
I've gotten a few of these. Started at 30% for a week, and then 20% for two weeks.