It's in the title? It's the official GravityForms plugin, supposedly version 2.9.13 fixes the issue, but the changelog [0] doesn't even mention the breach.
Any time I read the words vulnerable and plugin I just assume WordPress is involved somehow. I'm convinced that the internet would be instantly more secure if the entire platform died off.
It also would be a lot less useful. A lot of content is published through WordPress.
I suspect an effective approach would be encouraging ways to make WP more secure, or publish a secure platform that can easily be transitioned from WP.
[0] https://docs.gravityforms.com/gravityforms-change-log/