The Taipei Pass (台北通) app has a “service” tab at the bottom where you can report issues from within the app for a variety of categories, from COVID-19 related, to environmental violations, down to parking violations. The form is way simpler than the Taipei police form and I’ve always gotten a response within a few weeks.
Most recently, I reported a big trash pile around my neighborhood that was gross and unsightly. I received a response that it would be cleaned up, anti-littering notices were posted, and cameras will be installed to prevent it in the future. Way to go Taipei!
SO MANY violations around my neighborhood. Businesses blocking entire sidewalks with their wares, neighbors partially blocking sidewalks with their potted plants, trees planted into the sidewalks by the city in desperate need of attention, and not to mention streets without sidewalks in desperate need of a sidewalk.