Tape is illegal IMHO.
From the Article 1.3.002:
“A licence holder is not authorised to modify, in any way, the equipment given by the manufacturer used in competition.”
However the explanation says about 3:1 rule but I think it still affects any tape on bar..
Modifying equipment used in competition in relation to products supplied by the manufacturer is prohibited for obvious safety reasons. Whether it is a matter of modifying the length of the saddle, adapting approved wheels, filing off fork drop-out safety lugs, meeting the 3:1 rule by adding tape to handlebars or adding a nonslip system on the saddle, no modification of equipment that is not conducted by the manufacturer is authorised by the UCI without prior approval.
EDIT: Then I found this:
The addition of handlebar tape to improve the rider's grip is authorised, but tape must be identifiable and only used where the rider's hands grip the handlebars.
So, I am confused