"Lyft defines Active Riders as all riders who take at least one ride during a quarter where the Lyft Platform processes the transaction. An Active Rider is identified by a unique phone number. If a rider has two mobile phone numbers or changed their phone number and such rider took rides using both phone numbers during the quarter, that person would count as two Active Riders. If a rider has a personal and business profile tied to the same mobile phone number, that person would be considered a single Active Rider. If a ride has been requested by an organization using our Concierge offering for the benefit of a rider, we exclude this rider in the calculation of Active Riders, unless the ride is accessible in the Lyft App."

https://investor.lyft.com/news-and-events/news/news-details/2023/Lyft-Announces-Results-for-Second-Quarter-2023/default.aspx