If San Francisco had a motto for business regulation, it might be: Nothing succeeds like excess.

Ventures large and small here face a barrage of city-specific mandates, restrictions and fees, plus a dizzying array of permits and permissions just to open their doors. Businesses enjoying demonstrable success, it seems, can often be singled out for particular scrutiny.

In that respect, it’s not surprising that city transportation officials have turned their ominous attentions to Chariot, which has…