Not sure if prior art is relevant, per se (usually quoted in the context of patent law but IANAL), but, certainly, any copyright has expired by this point.
Seeing as the default font used by google's file reader is Roboto and that typeface has only been around since 2014, so my expression of 0 using Roboto is copyrighted 2014.
I do not know how any of you _hackers_ stole my original work, and I certainly do not authorize it's use. Immediately send me your full name and address so that I can have my lawyers contact you.