Their choice of 'Old Persian cuneiform' is also ... weird. I don't know how to phrase it, but seems doubly misleading. The time period they're preferring by that choice is ~500-300 BCE, whereas my appeal of cuneiform is that it's one of the earliest systems of writing, going back as 35 centuries BCE.
However it feels like you're lying when you say "Just tweet or text us", when you actually need to manually type out the message on a field in a Gumroad checkout widget... I think you should add better tech integration, or drop the tweet/ text part.