The abbreviation “WP” is not covered by the WordPress trademarks and you are free to use it in any way you see fit.
and
Similarly, a business related to WordPress themes can describe itself as “XYZ Themes, the world’s best WordPress themes,” but cannot call itself “The WordPress Theme Portal.”
Comments
The question still stands though. Why does wp engine get to infringe on WordPress trademark AND get access to server resources for free?
WordPress's trademark policy[0] explicitly said:
and
[0]: https://web.archive.org/web/20240901224354/https://wordpress...
That makes this seem pretty cut and dry…