Is this allowed in WordPress.org?
Restrictions for getting on the plugin repository
1. Your plugin must be GPL Compatible.
Looks GPL to me.
2. The plugin most not do anything illegal, or be morally offensive (that’s subjective, we know).
I don't see anything illegal or morally offensive.
3. You have to actually use the subversion repository we give you in order for your plugin to show up on this site. The WordPress Plugins Directory is a hosting site, not a listing site.
The plugin was definitely added to the repository
4. The plugin must not embed external links on the public site (like a "powered by" link) without explicitly asking the user's permission.
Don't see any of this going on.
Looks like the plugin makes the cut, at least according to the rules: