By Toby Sterling AMSTERDAM (Reuters) – Venture capitalists have invested billions of dollars in fast grocery delivery services such as Turkey’s Getir and Germany’s Gorillas and Flink, in a race to expand across Europe to meet soaring demand during COVID-19 lockdowns. But this new mainstay of city life is facing pushback from some residents and authorities who see the services as a blight on neighbourhoods, complicating the loss-making companies’ efforts to scale up and become profitable. At issue are the hundreds of small “dark stores” – distribution hubs for on-demand groceries where workers …