Yes actually, multiple even, most have to do with their numbers:
By the sheer force of eating everything and shitting upon everything, they disperse seeds of many plants
As above, they eat basically everything and help to clean the cities
They control insect population
They are important part of foodchain for predators, carrion feeders, insects etc. In many parts of the world also for humans
They apparently make great pets. For example in many parts of Poland, especially in cities, keeping flocks of pigeons was very popular and despite lessening in popularity it is still very much alive hobby.
As most birds they have great directional sense and could be trained to carry messages, until popularisation of radio around 80 years ago even military used them commonly. It’s also still part of the abovementioned hobby.
Overall yes, they can be useful to humans and are important part of ecosystem, especially in cities.
Yes actually, multiple even, most have to do with their numbers:
Overall yes, they can be useful to humans and are important part of ecosystem, especially in cities.