Spam clickers were popular 10+ years ago because that was pretty much the only type of idle game made at the time. People quickly realised how annoying having to click hundreds of time is, especially if the game is advertised as "idle", so they stopped making them.
You have to spam click even after you unlock the skateboard which makes no sense, and upgrading your speed is pointless because it doesn't help you get more coins or automate earning coins, it just changes a number on the screen slightly, it doesn't interact with anything else.
This game is just a much worse version of "build a spaceship" by Hevipelle, in that game you earn money per second based on distance travelled, so upgrading speed is relevant and feels meaningful. Also the goal that you are travelling towards is clear.