Bit of a selection bias... you are much more likely to notice the ones that are in the same spot day after day, and not notice the once that are in constant use.
This is the average revenue, I am sure there are some that generate a lot less/barely any.
Pricing for Bird looks like $1 to unlock and $.15 / minute to ride. I think it's not unrealistic to see utilization of at least 5 rides per day for $5 of revenue + average of 15 minutes per ride for the other $11 to get to $16 / day.
It's likely that there's a few that are much more highly utilized to balance out those that are not utilized at all.
This is the average revenue, I am sure there are some that generate a lot less/barely any.