This paper reviews the economic case for regulating ride-hailing and dockless bikeshare. Ride-hailing has disrupted heavily regulated taxi markets and is calling much of the rationale for taxi regulation into question. It argues for light-handed regulation to enable fair, nondistorting competition across the sector. A similar approach to bikeshare is needed, though the context differs greatly. These services are creating new mobility options, while their business models are evolving rapidly. Regulators should adopt a cautious approach which minimises the risk of undermining their potential.