I can agree with side.cr, and lyft.. That they are simply a platform by which drivers, and those wanting to be driven are able to reach other. However... Even though payment is voluntary the drivers are participating in a transportation service, and are subject to being regulated as one; non-profit or not.
Not a perfect example of this but similar is that craigslist might be a communication tool for those dealing in prostitution, but they are not the ones committing the crime.
The problem is that "communication platforms" don't normally run background checks, process payments, or offer insurance policies. Ironically, getting rid of these things - which serve to make the service safer - probably would make them more legally sound.
Not a perfect example of this but similar is that craigslist might be a communication tool for those dealing in prostitution, but they are not the ones committing the crime.