Here is another example of how police used tattoos and Etsy to identify this individual from a protest by following the etsy link, to their businesses website and linked in, where they found videos of the individual they couldn't identify with their mask. This is exactly why you should always cover up when participating in protests, even if you do not plan on participating in anything illegal. Make sure you wear clothing that cannot be identifying either as you see, they can figure out who purchases from smaller brands very easily.
https://6abc.com/philadelphia-police-car-set-on-fire-arrest/6252215/
https://6abc.com/philadelphia-police-car-set-on-fire-arrest/6252215/