Take a look at the video here:
The wax can end up pressed against your ear drum. That’s not good. Your eardrum needs space to vibrate so you can hear. And if you want to take on another line of reasoning: Earwax is actually good for us. It serves to protect the inside of the ear from dust and even insects. Do you really want to go and remove the last line of defense between your ear canal and insects? Yeah, I didn’t think so!