u/DayGloAlaMode

Here's an example of how much Lyft takes on a shared ride in Seattle (Only Amazon employees are allowed shared rides in Seattle.)

This ride took one hour and nine minutes, passengers paid $119.80, and I take home less than half of that.I have never seen Lyft make up the difference.

Of course, they don't tip, because they get these rides for FREE. I usually don't accept shared rides because you never make 50% of the payment. Sometimes you make far less than that. I've had shared rides where I got 40%.