Bolt Mobility, the Miami-based micromobility startup co-founded by Olympic gold medalist Usain Bolt, is expanding to 48 new markets after acquiring the assets of Last Mile Holdings. Bolt Mobility’s rise and Last Mile’s demise captures the uncertainty that plagued micromobility companies in the past year as the COVID-19 pandemic upended business models that were, in some cases, already on shaky ground. Bolt Mobility and Last Mile were both negatively affected by the COVID-19 pandemic.