Open source code-similar to PHP open source for free, how do they commercialize the operation?

PHP is open-source for free. What do official users eat and drink? How are they commercialized? Curious. PHP is open-source for free. What do official users eat and drink? How are they commercialized?
Curious.

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PHP is open-source for free. What do official users eat and drink? How are they commercialized?
Curious.

For example, laruence, one of the core developers of PHP7, is a Sina Weibo architect and chief PHP technical consultant. Do you think laruence hasn't eaten yet? Zend also has its own commercial services and products, such as Zend Studio + Zend Server, Zend Guard, training, certification, and technical support, for more information, see their mall:
Http://shop.zend.com/en
Open source can promote third-party contributions. laruence is not a Zend company, but a core developer. For example, Xdebug is not an official debugging extension, but it is better and more popular than the official ZendDebugger. If you use many products, you can earn money. It is worth noting that the founder of Zend is not the father of PHP, And this is open source.

You can also look at the MySQL database, which is also open-source and free. InnoDB, a transaction-supporting storage engine, is also contributed by a third party. As LAMP technology swept the Internet, more than $1 billion was sold to SUN, and the acquisition shocked the EU and is now under Oracle. However, the original author made another MariaDB and continued to make money through open source. There is also a Percona company specializing in the maintenance and support of MySQL for Linux, providing their MySQL-based Percona Server.

Although the PHP language is free and open-source, the PHP company Zend still has a lot of paid services and software, and the Project outsourcing certification training is all about money.

Open source is actually the most effective way to expand your influence.

The language is invented by people, so naturally we don't have to worry about revenue,
. Net is open-source. What's more about it?