This is not the way to get people on board with accessibility. Open a PR and fix the issue or come up with ways to make accessibility an easier branch to reach or more common knowledge.
Anyways, the reason that such situations piss me so much is because of the sucker punch that they feel like. You click on something that is text, it can't be anything but text, yet someone has converted it to a picture to make it pop up easier in social media which by the way excludes me from the fun that I expected to share.
But yea, it does suck that there is no accessible alt text.
My email is listed on my profile if you'd like to collaborate.
Edit: Abhishek has agreed to share the source for modification.
Edit: However, I can't find your email. Not sure why, but in your profile there is only some quote and "Can be reached on Freenode". Is the email kodah \at freenode.net?