![FILE - In this April 17, 2018 file photo, a woman rides a motorized scooter in Washington Square Park in San Francisco. Gov. Jerry Brown signed legislation Wednesday, Sept. 19, 2018, requiring helmets only for people under age 18 while riding motorized scooters. It's a win for companies such as Bird and Lime that operate the popular scooters in major cities across California and the country. (AP Photo/Jeff Chiu, File)](https://thenational-the-national-prod.cdn.arcpublishing.com/resizer/v2/CWWV53IJG2Y7HSJ7737VPKH5W4.jpg?smart=true&auth=7d6354d78a12dd48dbe0a6601fae8c004e00af0db207c7ba9a58cae74e22a0e6&width=400&height=225)
Start-ups such as Bird and Lime operate an employment system that many say leaves workers vulnerable. AP
Start-ups such as Bird and Lime operate an employment system that many say leaves workers vulnerable. AP
Scooter rental firm Bird illustrates 'gig' economy realities
Controversial alternative to using employees shows up the uncertain prospects for people relying on gig economy platforms for income