A traditional independent contractor would choose which jobs they take. Many musicians, for instance, might turn down a gig because they don't want to drive to the location, or might ask negotiate for more money because of it. A guy mowing my lawn might ask for more money if my lawn is particularly difficult, or deny the job if we can't come to an agreement. Rideshare apps deny their so called "contractors" this freedom that most contractors have. They could certainly give their drivers the ability to negotiate terms, as every other contractor gets to do, but they don't. It is the denial of this freedom that makes them employees.