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Norway Maples are absolutely invasive and unfortunately everywhere. They were planted extensively from the 50s through the early 2000s because they're resistant to salt and soil compaction. Unfortunately they're also extremely prolific and form extremely dense canopies that shade out competition. They're also allelopathic which means that they produce a toxin that poisons other plants in their vicinity to eliminate competition which means that they also end up contributing to soil erosion as they prevent other plants from growing whose roots would have otherwise bound the soil together.

Removing Norway Maples is always good and I think the city and NCC should be a lot more aggressive about getting rid of them and replacing them with native trees that contribute to the ecosystem.