This is the playbook that works for ridesharing as well (which seems to be an oft-cited example of this)... in a larger city the density of riders and drivers i

This is the playbook that works for ridesharing as well (which seems to be an oft-cited example of this)... in a larger city the density of riders and drivers is sufficiently high the market is able to support a 2-company system. In smaller markets, it quickly tilts into one of companies because no driver will stay on a platform without demand (long wait times for a ride), and no rider will use a platform without sufficient supply (high ETAs).