Attribution in the source would suffice if it really bothers you. Almost all open source software has attribution as a requirement (ever look at your iPhone Settings->About->Legal->Legal Notices)
That being said, we could potentially CC0 the graphics in the future but attribution isn't much to ask.
Attribution requirement is enough to break the FSF guidelines, and not compatible with free licenses. What means that this font can not be used in BSD or GPL software.
No open source software has attribution as a requirement by definition.
Anyway, there's nothing wrong with any of that if it's really what you want. What's wrong is thinking that the requirement is banal, and thus harmless.
True but I didn't say all, I said most. I do think the requirement is banal because almost every piece of open source software you use requires some level of attribution.
That being said, we could potentially CC0 the graphics in the future but attribution isn't much to ask.