@Khall I do not see any set limit for tips. Uber customers are allowed to enter a custom tip amount. On the driver side, the same thing too, I don’t any limit to Uber tip matching.
Checked out the disclaimer, the only condition is that the tip needs to be given within 24 hours of the ride. Here’s the quote:
Match limited to in-app tips added within 24 hours of trips started after 12am PT on Tuesday, August 15 and before 11:59 PT on Tuesday, 8/15. It does not apply to Commute.