Being able to travel almost 100 miles in just an hour is a pretty significant advantage to motor vehicles. Not everything is within cycling distance. Not everybody lives in your overcrowded city.

Cause you can't actually GO anywhere on a bike. If you want to go somewhere 200 miles away for a week, it'd take a day and a half each way, minimum, and you can't bring anything with you bigger than a backpack. It's also physically strenuous to go literally anywhere, even the places you are allowed to go.