more reason they need to financially support Wordpress.
WP Engine = Cheapskates. They need calling out.
Automattic has more investors, including BlackRock which is worth more than Silver Lake:
https://app.dealroom.co/companies/automattic
Also, as mentioned previously in the thread, contributions are not mandatory to open-source, financially or man hours. Wordpress has a Five for the Future, where entities contribute 5% of their resources (financial or man hours) to Wordpress or Wordpress initiatives, and WPEngine already does so, more than most other entities. This also includes companies like Namecheap, who are not part of Five for the Future, have used the Wordpress trademark similarly and have never publicly contributed to Wordpress.
Whether or not WPEngine is private equity backed or not does not matter; most people could give two ****s about them, and even if people use them, it is mostly ease of use for their clients. People are angry at Matt for his attitude and the actions he has taken, many of which have shown issues with the relationship between Automattic, Wordpress Foundation and Wordpress.org, and specifically with how much control he has and how easily he can abuse that control.
Companies should obviously contribute to projects they profit from, but that also applies to Automattic who only contributes 0.3% of their revenue ($225k) to PHP, and probably less to other projects as well.
This drama isn't about the contributions, but literally about the actions Matt has insisted on continuing to have because he does not get what he wants.

WPEngine isn't even a victim here, but they're certainly not the bad guy either.