Thanks for sharing this! That's absolutely concerning, and definitely opens up a possibility for monkey business if fraudsters can just scribble down anything in the signature field. Given the millions of mail ballots in Pennsylvania in 2020, I would expect someone noticing ballot theft at scale (i.e., "I never got my mail ballot but it says I already voted!"), but regardless this is something I would still want corrected if I were a Pennsylvanian. Is the standard still the same?

The signature match is an important part of the mail ballot process, one that even California does.