All too often backup is a very long ways away, and without a helicopter its almost impossible to keep up with a sport bike determined to get away. Attempting to conduct a traffic stop on that many riders was a very bold move on the officers part.
The riders know the officer cannot force them off the road because if a collision occurs the officer will be found at fault.
With video of their actions, and license plates on file they were probably all issued citations which were mailed to their addresses.
...would not be surprising if none of the bikes had plates...on that ride...